Failed to decode packet 'clientbound/minecraft:set_entity_data'

[DarkChromaMC]

'/viaversion dump' Output

https://dump.viaversion.com/aead33eb5ce1d18f361994316d68b4d157ad72b0eab02b2b65e95f1d205db535

Server/Client Error

My minecraft launcher crashes with the following:

[disconnect-2025-07-03_21.02.54-client.txt](https://github.com/user-attachments/files/21033753/disconnect-2025-07-03_21.02.54-client.txt)

When a player has an item with equipable set to player as allowed.

I.e., wit this item:
/minecraft:give DarkChroma minecraft:paper[equippable={slot:head,allowed_entities:["minecraft:player"]}]

Bug Description

I get kicked from my minecraft server running 1.21.7 when playing on vanilla Minecraft 1.21.4.

It seems to happen when near a build with things like chests, barrels, armor stands, item frames, etc. Not sure exactly what item.

Steps to Reproduce

1. Update server to run papermc 1.21.7
2. Join the server using minecraft launcher 1.21.4
3. Travel to a build with armorstands, item frames, etc.

Expected Behavior

1. The client does not crash upon loading those chunks

Additional Server Info

No response

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. Velocity), not on both.
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried a build from https://ci.viaversion.com/ and the issue still persists.

[Barvalg]

Athena Log Analysis

Platform Information:

Property	Details
Contains Via	❌
Platform Type	unknown
Is Proxy	❌

[FlorianMichael]

Can't reproduce this, also the error you linked can't be opened. Can you send it again and maybe try with latest builds?