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With very recent snapshots I have users reporting full UI freeze but without ANR or crash, the music service still plays. Swiping the app and restarting fix and music is not interrupted. I have no idea how the UI can freeze without ANR, is there some Compose component that handle the UI refresh from background thread so I know what CL to search for and try to find the culprit CL.

So seing some other crash on that build with Semantics I suspect it's <https://android-review.googlesource.com/c/platform/frameworks/support/+/3296711> that was just reverted with links about multi threading access to the snapshots. Will test but If someone can explain how a deadlock on the snapshots can block the UI yet not ANR I'd like to understand.

And confirmed, opened <https://issuetracker.google.com/issues/375219962> as there's already a revert of the revert and not sure those issues where seen. <@UPD4B7W3U>