Description

Mekanism cardboard box with a vanilla blaze spawner spams the crafting terminal inventory, like so:
https://gyazo.com/d9498aca513db11ec8ce947efc531be8

Expected: One box in the terminal.

Environment

Mekanism 9.4.11.349
Dedicated server
No ME drives, only storage buses on EnderIO warehouses and Actually Additions wooden crates. I suspect that this may be an interaction with the warehouse.

• Minecraft Version: 1.12.2
• AE2 Version: rv6-alpha-1
• Forge Version: 14.23.4.2705

Can you inspect the NBT data of the cardboard boxes? This should only happen if the items have different NBT or caps attached to it.

I'm not sure I was clear. There is only one actual cardboard box in the system. As soon as it displays on the screen, the icons begin to increase as seen in the gif I linked. Closing the terminal and opening it again restarts the effect.

As for the single box: this is the NBT
NBT: {mekData:{blockData:{meta:0,id:52,tileTag:{MaxNearbyEntities:6s,RequiredPlayerRange:16s,SpawnCount:4s,SpawnData:{id:"minecraft:blaze"},MaxSpawnDelay:800s,Delay:369s,x:-116,y:56,z:-161,id:"minecraft:mob_spawner",SpawnRange:4s,MinSpawnDelay:200s,SpawnPotentials:[{Entity:{id:"minecraft:blaze"},Weight:1}]}}}}

When trying to reproduce this, I set up a minimal AE system with a single drive and single storage cell, placed a cardboard box with a spawner in, and was unable to get it out at all, although the visual effect didn't happen.

After some debugging, this seems to be an issue with Astral Sorcery attaching caps to random stuff. I don't know why it only affect a filled cardboard box. Removing Astral Sorcery fixes the issue for me.
Can you confirm?

Maybe this is the same issue? HellFirePvP/AstralSorcery#780

Ok, after having a short look i think i know what is going on.
Astral Sorcery attaches caps based on getMaxStacksize, which changes for the cardboard box after ItemStack creation (setBlocklData). So the dropped cardboard item has a cap, but the serialized/deserialized ItemStack in the storage cell does not (because the correct block data is present at ItemStack creation).
Please open an issue with these mods.