Crates with a reduced max capacity are slightly buggy with inserting items.
When a crate with a reduced size has items shift-clicked in that would be above its capacity, the transfer fails.

Steps to reproduce:
Place a crate.
Using Quark config, set the max stack size to 96.
Try to put two stacks of items in.

When a crate with a reduced size has items shift-clicked in that would be above its capacity, the transfer fails.

This is intended.