- Fix a bug where an appservice may not be forwarded events for a room it was recently invited to. Broken in v1.22.0. ([\#8676](https://github.com/matrix-org/synapse/issues/8676))
- Fix `Object of type frozendict is not JSON serializable` exceptions when using third-party event rules. ([\#8678](https://github.com/matrix-org/synapse/issues/8678))
- Fix a bug where an appservice may not be forwarded events for a room it was recently invited to. Broke in v1.22.0. ([\#8676](https://github.com/matrix-org/synapse/issues/8676))
- Fix `Object of type frozendict is not JSON serializable` exceptions when using third-party event rules. Broke in v1.22.0. ([\#8678](https://github.com/matrix-org/synapse/issues/8678))