Backfill: replies are not handled

[jtagcat]

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Running docker built from source (https://github.com/mautrix/meta/commit/682c4d75b0fdfe102af4b6d88bb5c76453adc86d)

What's your debugging setup? Debugging my docker stuff as-is is currently very annoying with networking. Haven't migrated everything to k8s yet (storage + backup issues).