Thanks to creator reports, the team identified a bug with the sound gizmos that began after the V52 update. We should have a fix in the next few days.
If you have been affected by this bug, but have been able to fix these audio gizmo issues, please refrain from going into edit mode until we have communicated that the bug has been resolved. This will prevent you from having to make edits to your world again. We will post an update here once the fix has landed in Horizon Worlds.
Thank you for your continued feedback and support of Horizon Worlds.