- Fix the `PeriodicallyFlushingMemoryHandler` inhibiting application shutdown because of its background thread. ([\#10517](https://github.com/matrix-org/synapse/issues/10517))
- Fix the `PeriodicallyFlushingMemoryHandler` inhibiting application shutdown because of its background thread. ([\#10517](https://github.com/matrix-org/synapse/issues/10517))
- Fix a bug introduced in Synapse v1.40.0rc1 that would cause Synapse to respond with an error when clients would update their read receipts. ([\#10531](https://github.com/matrix-org/synapse/issues/10531))
- Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update their a receipts. ([\#10531](https://github.com/matrix-org/synapse/issues/10531))
