Error on initial sync and initial sync filter discarded #23435
Description
Steps to reproduce
- Open develop.element.io
- Login to matrix.org
- Observe error
Outcome
What did you expect?
No errors, initial sync filter to be valid & apply
What happened instead?
Regressed by matrix-org/matrix-js-sdk#2726
Operating system
No response
Browser information
No response
URL for webapp
No response
Application version
No response
Homeserver
No response
Will you send logs?
No