20.1.09 Bug Assertion failed

Thank you for bringing this to our attention. We’ve recreated the issue and passed it along to our dev team who will work on a fix.
In the meantime, it looks like the issue comes down to the FMOD Studio Event Emitter not getting along with Image & Text components, so you can get around this by doing the following:

  1. Add an empty game object to your button
  2. Remove the FMOD Studio Event Emitter from the button and add it to the new child game object instead