fix: keep stashBuffer when exception throw again #669 #1280

Job	Run time
Compile (testkit/Test/compile actor-tests/Test/compile)	3m 30s
Compile (actor-testkit-typed/Test/compile actor-typed-tests/Test/compile)	3m 21s
Compile (bench-jmh/Test/compile)	5m 47s
Compile (cluster/Test/compile cluster-tools/Test/compile cluster-typed/Test/compile distributed-d...	7m 37s
Compile (discovery/Test/compile coordination/Test/compile)	4m 8s
Compile (persistence/Test/compile persistence-shared/Test/compile persistence-query/Test/compile ...	7m 29s
Compile (pki/Test/compile slf4j/Test/compile)	3m 3s
Compile (serialization-jackson/Test/compile)	4m 21s
Compile (stream/Test/compile stream-testkit/Test/compile stream-tests/Test/compile stream-typed/T...	5m 55s
Compile (stream-tests-tck/Test/compile)	3m 56s
Compile (remote/Test/compile remote-tests/Test/compile protobuf-v3/Test/compile)	5m 18s
	54m 25s

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