There is a bug on "3.4.0" version. If you switch weapons at quickslot, they lose ammo and attachments.
I tested the new update on my testserver and loaded only this plugin:

(18:31:43) | Listing 1 plugins:
01 "Stack Size Controller" (3.4.0) by AnExiledGod (13.12s) - StackSizeController.cs