Question World Space button non-interactable; HDRP & Input System

Hey what's up!

I have a project that I decided to build using UI Toolkit and UI Elements... However, upon needing text in world space, I discovered that UI Toolkit does not support world space elements yet.

Therefore, I tried creating a world space canvas with a button to solve this problem... I am now running into an issue where the button is non-interactable. I have looked at other threads, and have tried about a dozen proposed solutions that have worked for others... The button is still non-responsive.

If I switch the canvas to use 'Screen Space - Overlay' the button works as intended. It seems to be some kind of issue with having a world space canvas in particular.

I've tried many solutions, such as the ones posted in threads like this - https://forum.unity.com/threads/gui-button-doesnt-work-in-world-space.265048/

My best guess is that there is some kind of interference between the new UI Toolkit, Input System, and the legacy Unity UI. Any help on this will be greatly appreciated...