Player Head Items Fail to Stack

Custom MythicMobs items created using the player_head material are currently not stacking as expected when multiple copies are obtained. This issue only affects items with the player_head base-all other MythicMobs item types without this base continue to stack normally in inventory. There are no visible errors during server startup or when using the /mm item command to generate the items.

1. Define a MythicMobs item using player_head as the base material-tested items included texture data and custom NBT, but complexity does not appear to be the root cause.

2. Give yourself multiple copies of the item via the command /mm items give [item_name] 6 or obtain several from mob drops.

3. Observe that each head occupies a separate slot in your inventory, regardless of being identical

Identical player head items should stack automatically, matching vanilla Minecraft behavior where stacks of the same head type can go up to 64.

Still reporting this issue: #2080 (closed)

MythicMobs Version: 5.11.0-SNAPSHOT-03e52820

MythicCrucible Version: 2.2.0-SNAPSHOT

Server Software: Purpur version 1.21.10-2523-HEAD@d22f66f