Hey Rob,
I think I know what happened here.
It’s a combination of this change Synchronize GrpcSyncRetryer and GrpcAsyncRetryer behavior, make non-final exceptions INFO level by Spikhalskiy · Pull Request #1065 · temporalio/sdk-java · GitHub that aligned our logging in several places and this bug getResultAsync long poll request gets terminated by rpcTimeout · Issue #1197 · temporalio/sdk-java · GitHub that became visible because after the logging changes.
I will take care of it as a part of the next release and we will see if it solves your problem.