Backport "Fix #20856: Serialize Waiting and Evaluating as if null." to 3.5.2
#21465
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This strategy ensures the "serializability" condition of parallel programs--not to be confused with the data being `java.io.Serializable`. Indeed, if thread A is evaluating the lazy val while thread B attempts to serialize its owner object, there is also an alternative schedule where thread B serializes the owner object *before* A starts evaluating the lazy val. Therefore, forcing B to see the non-evaluating state is correct. [Cherry-picked e242753]
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Backports #21243 to the 3.5.2 branch.
PR submitted by the release tooling.
[skip ci]