This plugin was originally made for Paper. I didn't realise I was using some simple Paper-only stuff. I have rewritten a few lines so that it also runs on Spigot now.

Tooltips used to always show up above the container. With this update, tooltips might appear in front of the container instead of above it. This will happen if the container has a block above it. This will make the tooltips more useful when you have chests stacked on each other for example.

It can also be configured as the default location with a new option in the config:
Enabling this option will have the tooltips show up in front of the container even when there is no block above the container.

This plugin was made in 1.20.6 and compiled with Java 21. It has been downgraded to 1.20 and compiled in Java 17 so it can be used in any version of 1.20 now.