The idea of the plugin is really cool for RPG servers. Although it doesn't present any kind of error in console, and seems to be working on my 1.20.6 server, I think there are some adjustments that need to be made.
The items are not falling flat on the ground, as shown in your image; they fall upright and are "half buried" in the ground. Items are not collected when passing over. We have to right-click on the item to pick them up (is that how it works?). Many times some items collected from the ground simply disappear from the inventory.
I would like the plugin to be updated to the latest versions. It would be an excellent addition to servers!