Here are the mods installed

Only occurs when you open a gui with architecure craft blocks with the Mystical Agriculture intergration is enabled in the configs. Once off in the configs, the game doesnt crash.
The Client Crash Report
---- Minecraft Crash Report ----
WARNING: coremods are present:
GTCELoadingPlugin (gregtech-1.12.2-1.13.0.681.jar)
GACoreMod (Gregicality-1.12.2-0.21.5.1.jar)
Contact their authors BEFORE contacting forge
// Daisy, daisy...
Time: 3/28/21 3:44 AM
Description:
CCL Has caught an exception whilst rendering an item.
Item Class: class com.elytradev.architecture.common.shape.ItemShape
Registry Name: architecturecraft:shape
Metadata: 0
NBT: {Shape:0,BaseName:"minecraft:planks",BaseData:0}
Model Class: class net.minecraftforge.client.model.ModelLoader$VanillaModelWrapper$1
Model Location: architecturecraft:custitem#normal
You can turn off player messages in the CCL config file.
If you want CCL to attempt to recover the game next time, enable it in the CCL config.
java.lang.ClassCastException: net.minecraft.item.ItemAir cannot be cast to net.minecraft.item.ItemBlock
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems.lambda$null$12(MysticalAgricultureItems.java:256)
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems$$Lambda$978/96624052.func_186726_a(Unknown Source)
at net.minecraft.client.renderer.color.ItemColors.func_186728_a(ItemColors.java:148)
at com.elytradev.architecture.client.render.shape.ShapeRenderDispatch.renderItemStack(ShapeRenderDispatch.java:86)
at com.elytradev.architecture.client.render.RenderingManager$CustomItemRenderOverrideList.handleItemState(RenderingManager.java:384)
at net.minecraft.client.renderer.RenderItem.func_184393_a(RenderItem.java:248)
at codechicken.lib.render.item.CCRenderItem.func_184393_a(CCRenderItem.java:393)
at codechicken.lib.render.item.CCRenderItem.func_184391_a(CCRenderItem.java:334)
at codechicken.lib.render.item.CCRenderItem.func_180450_b(CCRenderItem.java:323)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
A detailed walkthrough of the error, its code path and all known details is as follows:
-- Head --
Thread: Client thread
Stacktrace:
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems.lambda$null$12(MysticalAgricultureItems.java:256)
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems$$Lambda$978/96624052.func_186726_a(Unknown Source)
at net.minecraft.client.renderer.color.ItemColors.func_186728_a(ItemColors.java:148)
at com.elytradev.architecture.client.render.shape.ShapeRenderDispatch.renderItemStack(ShapeRenderDispatch.java:86)
at com.elytradev.architecture.client.render.RenderingManager$CustomItemRenderOverrideList.handleItemState(RenderingManager.java:384)
at net.minecraft.client.renderer.RenderItem.func_184393_a(RenderItem.java:248)
-- Item being rendered --
Details:
Item Type: com.elytradev.architecture.common.shape.ItemShape@d9a9c76
Item Aux: 0
Item NBT: {Shape:0,BaseName:"minecraft:planks",BaseData:0}
Item Foil: false
Stacktrace:
at codechicken.lib.render.item.CCRenderItem.handleCaughtException(CCRenderItem.java:188)
at codechicken.lib.render.item.CCRenderItem.func_184391_a(CCRenderItem.java:343)
at codechicken.lib.render.item.CCRenderItem.func_180450_b(CCRenderItem.java:323)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative
Mouse location: Scaled: (354, 46). Absolute: (1061, 759)
Screen size: Scaled: (534, 300). Absolute: (1600, 900). Scale factor of 3
Here are the mods installed

Only occurs when you open a gui with architecure craft blocks with the Mystical Agriculture intergration is enabled in the configs. Once off in the configs, the game doesnt crash.
The Client Crash Report
---- Minecraft Crash Report ----
WARNING: coremods are present:
GTCELoadingPlugin (gregtech-1.12.2-1.13.0.681.jar)
GACoreMod (Gregicality-1.12.2-0.21.5.1.jar)
Contact their authors BEFORE contacting forge
// Daisy, daisy...
Time: 3/28/21 3:44 AM
Description:
CCL Has caught an exception whilst rendering an item.
Item Class: class com.elytradev.architecture.common.shape.ItemShape
Registry Name: architecturecraft:shape
Metadata: 0
NBT: {Shape:0,BaseName:"minecraft:planks",BaseData:0}
Model Class: class net.minecraftforge.client.model.ModelLoader$VanillaModelWrapper$1
Model Location: architecturecraft:custitem#normal
You can turn off player messages in the CCL config file.
If you want CCL to attempt to recover the game next time, enable it in the CCL config.
java.lang.ClassCastException: net.minecraft.item.ItemAir cannot be cast to net.minecraft.item.ItemBlock
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems.lambda$null$12(MysticalAgricultureItems.java:256)
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems$$Lambda$978/96624052.func_186726_a(Unknown Source)
at net.minecraft.client.renderer.color.ItemColors.func_186728_a(ItemColors.java:148)
at com.elytradev.architecture.client.render.shape.ShapeRenderDispatch.renderItemStack(ShapeRenderDispatch.java:86)
at com.elytradev.architecture.client.render.RenderingManager$CustomItemRenderOverrideList.handleItemState(RenderingManager.java:384)
at net.minecraft.client.renderer.RenderItem.func_184393_a(RenderItem.java:248)
at codechicken.lib.render.item.CCRenderItem.func_184393_a(CCRenderItem.java:393)
at codechicken.lib.render.item.CCRenderItem.func_184391_a(CCRenderItem.java:334)
at codechicken.lib.render.item.CCRenderItem.func_180450_b(CCRenderItem.java:323)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
A detailed walkthrough of the error, its code path and all known details is as follows:
-- Head --
Thread: Client thread
Stacktrace:
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems.lambda$null$12(MysticalAgricultureItems.java:256)
at gregicadditions.integrations.mysticalagriculture.items.MysticalAgricultureItems$$Lambda$978/96624052.func_186726_a(Unknown Source)
at net.minecraft.client.renderer.color.ItemColors.func_186728_a(ItemColors.java:148)
at com.elytradev.architecture.client.render.shape.ShapeRenderDispatch.renderItemStack(ShapeRenderDispatch.java:86)
at com.elytradev.architecture.client.render.RenderingManager$CustomItemRenderOverrideList.handleItemState(RenderingManager.java:384)
at net.minecraft.client.renderer.RenderItem.func_184393_a(RenderItem.java:248)
-- Item being rendered --
Details:
Item Type: com.elytradev.architecture.common.shape.ItemShape@d9a9c76
Item Aux: 0
Item NBT: {Shape:0,BaseName:"minecraft:planks",BaseData:0}
Item Foil: false
Stacktrace:
at codechicken.lib.render.item.CCRenderItem.handleCaughtException(CCRenderItem.java:188)
at codechicken.lib.render.item.CCRenderItem.func_184391_a(CCRenderItem.java:343)
at codechicken.lib.render.item.CCRenderItem.func_180450_b(CCRenderItem.java:323)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative
Mouse location: Scaled: (354, 46). Absolute: (1061, 759)
Screen size: Scaled: (534, 300). Absolute: (1600, 900). Scale factor of 3