Same sac of holding stacking but disappearing if put on ground

[antoine-courant]

Minecraft Version: 1.18.2

Forge Version: 40.0.17

Mod Version: 1.6.18

Single Player or Server: Server

Describe problem (what you were doing; what happened; what should have happened): When you're using an empty sac of holding to contain the same content (chest with same items, same spawner...), the two sacs ar stacking, but if you put it back on the ground, you only get back one sac and the other full one disappear Either it should not stack in this case, either let the other one full and present It does the same if I have three or even more sac with same content

Log file link:

Video/images/gifs (direct upload or link):

[Lothrazar]

i have it set to max stack size 1 (.stacksTo(1).) no matter what the NBT or contents, so im not sure whats clumping them together https://github.com/Lothrazar/Cyclic/blob/ad14019258148818f82b73ca12057862a6d5305e/src/main/java/com/lothrazar/cyclic/registry/ItemRegistry.java#L292