OnDeactivateAsync not called on silo shutdown

[peter-perot]

We are using Orleans version 7.2.6 and observe the following problem:

When the silo is shut down, grain method OnDeactivateAsync is not called, but only if the grain is marked as a [StatelessWorker] (the same is true when using the attribute with a parameter, e.g. [StatelessWorker(1)]). As soon as I remove the attribute, method OnDeactivateAsync is called as expected.

This behavior is only observed on silo shutdown: when the grain deactivates during activation garbage collection, the method is called correctly.