Fix potential client memory leak in ManaNetworkHandler

(fixes #4946)

Author: TheRealWormbo

Xplat/src/main/java/vazkii/botania/common/handler/ManaNetworkHandler.java

@@ -106,7 +106,7 @@ private <T> void remove(Map<Level, Set<T>> map, Level level, T thing) {
 	}
 
 	private <T> void add(Map<Level, Set<T>> map, Level level, T thing) {
-		map.computeIfAbsent(level, k -> new HashSet<>()).add(thing);
+		map.computeIfAbsent(level, k -> Collections.newSetFromMap(new WeakHashMap<>())).add(thing);
 	}
 
 	@Override

web/changelog.md

@@ -38,6 +38,7 @@ In the meantime, Botania for Minecraft 1.20.1 may still receive updates for bug
 * Fix: Don't let Alfheim portal grab items in the tick it shuts down (e.g. for gluten reasons)
 * Fix: Astrolabe no longer attempts to place blocks in the player's head location while underwater
 * Fix: Mana bursts going through a nether portal could cause lag spikes
+* Fix: Potential client memory leak in ManaNetworkHandler
 
 ---