[RLlib] Issue 12516: Trainer.compute_action() throws error w/ Dict observation space and num_workers > 0. #12706
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This PR fixes issue 12516:
The problem was that the local-worker (driver) was using the already preprocessed space (got it from the remote-worker) to build its own policy/preprocessot stack. That's why the necessary DictFlatteningPreprocessor was never built and your Trainer did not do any preprocessing (on your input dict's observation) prior to sending the data to the Policy.
Closes issue #12516
Closes issue #12516
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