Can not accept room invitation via "Accept" button in rooms list

[TheReal1604]

Steps to reproduce

1. Where are you starting? What can you see?
   User A creates a private room, for example with element-x and invites User B to the room.
   User B gets a notification about the room invitation and the new room invitation gets displayed in the room list with two buttons "Decline / Accept".

2. What do you click?
   When you click on accept, a request to
   /_matrix/client/v3/rooms/!<roomid>:my_synapse_domain.foo/state' clientproto='HTTP/1.1' site='8008'> SynapseError: 403 - User @dummy:my_synapse_domain.foo not in room !<roomid>:my_synapse_domain.foo, and room previews are disabled is made. And synapse responds with a 403 error.

If you click on the room, not the buttons and join the room via this screen, it works to join the room.

Outcome

What did you expect?

Accepting an invite via "Accept Button" in the room list does work and the user is joining the room.

What happened instead?

Message "An Error Occured"

Your phone model

IPhone 15 Pro

Operating system version

18.1.1

Application version

1.9.10

Homeserver

synapse 1.121.1

Will you send logs?

No