With the release of liquid glass last year, I was trying to migrate my AUv3 to use native toolbars, and I noticed on macOS, AUv3's toolbar wouldn't display in Logic Pro (pretty sure it was the same with Ableton Live).
But on iOS, it was fine.
In the end, I decided to continue to use my custom toolbar because I had more control, but I thought I'd mention it here in case it can be fixed and warn the other users hitting the same issue.
Another thing I noticed on the desktop is that presentation animations were removed. For example, AUv3 trying to show a popover on macOS inside, say Logic Pro, would make the popover appear instantly, with no animation. But animations worked great on iPadOS, however.
Hi. That sounds unexpected! Was this a SwiftUI front-end ? Could you please try to put together a minimal sample-AU that reproduces this problem ? That would help us diagnose and fix this issue. Please be sure to file a feedback request on https://feedbackassistant.apple.com
Thank you!