Only under special AOT flag or in debug VM failure to generate or load AOT code should cause VM exit with message or hit assert/fatal.
By default the failed AOT code should be discarded with UL message about it by request (log_info) and VM and AOT process should continue run. Or stop AOT code processing (for exampale, when no reserved memory for AOT code left).
Unless we hit some catastrophic failure: OOM fro example. This is similar how JIT compilers behave.