This plugin that I made over a few hours or so stops people from putting items in shelves, since apparently they're being used to dupe items.
Important note: OPs by default have the permission nodes to bypass the checks, if you're wondering why it might not be working, try deoping yourself.
Permission nodes, or well a single node:
tempShelvesFix.bypass: Used to bypass for testing purposes.
Demonstrated on my YouTube channel:
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/s4DYoub2pB0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>No gallery available for this project.