Error given when trying to answer a DM where the DMer has left(?) is wrong.

[ara4n]

Steps to reproduce

1. Receive a DM
2. Try to answer it
3. Discover the DMer has left the room, and it's winked out of existence
4. Stare at a very detailed and completely misleading error message

Outcome

What did you expect?

A prompt that says something like "You cannot answer this invite as the inviter left the conversation ".

Operating system

No response

Browser information

No response

URL for webapp

develop

Application version

No response

Homeserver

No response

Will you send logs?

No

[ara4n]

This is the same room (and same problem) as element-hq/element-x-ios#2289

See also matrix-org/matrix-spec#95

[ara4n]

regression of matrix-org/matrix-react-sdk#5061 and #14722

[ara4n]

I'm guessing it regressed somewhere around matrix-org/matrix-react-sdk#6048