Backport of "amc: Fix crash when a sync_meta survives its sink" into 1.16
Backport of !603 (merged) "amc: Fix crash when a sync_meta survives its sink".
Commits:
- 9b9e39be amc: Fix crash when a sync_meta survives its sink
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Backport of !603 (merged) "amc: Fix crash when a sync_meta survives its sink".
Commits: