Today I stumbled upon a weird bug when using the M3S. I restarted the server but nothing changed. I also spawned a whole new M3S and still get the same bug.
Basically, when I put planks in the planks storage of the M3S, the first stack is ok (20/100). Then when I try to put the second 20 stack, the storage shows 14.4/100. When I remove the 14.4 stack, nothing is in the M3S anymore and the stack In my hands is a 14.4 stack.
I attached a video showing the bug in the "Additional Information" section.