It is a heavy bug that if you put empty/filled shulker box in barrel, every shulker box you put after that will be converted to it. It will end up with item duplication or item deleting

Thanks for your issue report. This looks like the same problem as #83 which will be fixed in 1.1.0 later today, however I'll leave it open for now since I'm not able to confirm.

Hello, thanks for the response, I experimented with some of the other items and problem is not about shulkers it about items with nbt data. I hope you keep an eye on that. Thanks

Alright the version that fixes this should be uploaded soon. If you run into any more issues we can continue discussing on #83 because it was the first report of this bug.