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Created attachment 15585 [details]
Attached a simple repro project: it creates a custom Awaiter and stores it in queue/pool.
It usually result in a crash during GC (repro project contains a few GC.Collect(0) to help it trigger early).
Also, it happens with ARM64 but not ARMv7.
Tested against the latest stable version released march 31st and it seems fixed (had this problem during the last 8 months, so I was surprised that a minor release might have fixed it).
I will reopen if it happens again.