zglib

I have done some more testing, figured out a handful of cases where no longer allowed data values are the culprit, but have not been able to figure the issue with the one pictured in the attachment. I have included a file with some examples of unusual behavior with disallowed items in and out of shulker boxes, and also the original undiagnosed shulker box from my original hotbar file

I have added images which I believe convey the issue, I was unable to recreate it by purposefully saving testing boxes in 1.20.4, but it continues to fail to load some I already had

Here's the original process I used, which I probably should have described initially. Shown on 23w14a (along with an update that any amount over 64 will do the same thing)