Describe the bug
Netherite Shulker Boxes can be recursively stacked inside each other. This can and will eventually cause a game crash by hitting the NBT tag depth limit.
To Reproduce
Put a netherite shulker box inside another netherite shulker box.

Expected behavior
You're able to put a netherite shulker box inside another netherite shulker box. This is not possible with normal shulkers.

What other mods do you have installed?