A server being offline during app load can/does cause spurious room upgrade warnings

[turt2live]

We should retry the capabilities request

[ara4n]

this feels misprioritised - it's a horrible wart when it happens, and it's not exactly implausible for a server to be in patchy connectivity.

[aaronraimist]

The reason you probably noticed it recently is that v7, v8, and v9 aren't included in hardcoded list of safe room versions that element uses as a workaround to this bug. https://github.com/matrix-org/matrix-js-sdk/blob/1bb82108b742d2ab8fa647dfd2bcc198ac487904/src/models/room.ts#L52-L59

matrix-org/matrix-js-sdk#2318 will add those versions to the list until a proper solution is implemented

[turt2live]

note that the js-sdk should already be working around this issue by treating the room versions as "probably safe" regardless of the array - there's clearly a bug in that code, somewhere. (or it was never written and I'm imagining it was)

[t3chguy]

Duplicate of #16068

[ara4n]

It's not a duplicate of #16068, which is about js-sdk not being told about wrong room versions. This is about connectivity failures during launch causing spurious errors, i think?