Edited message in thread with reaction throws error: Can't load this message (m.room.message) - Cannot read properties of null (reading 'getMyMembership')

[MadLittleMods]

Steps to reproduce

1. Start a thread
2. Add some thread replies
3. React to one of the replies
4. Edit the reply you reacted to
5. Clear cache and refresh
6. Notice the thread now has a Can't load this message (m.room.message), Submit logs (tile error boundary) for the message in question

react_devtools_backend.js:3973 TypeError: Cannot read properties of null (reading 'getMyMembership')
   at ReactionsRow_ReactionsRow.render (ReactionsRow.tsx:170:32)
   at qi (react-dom.production.min.js:187:125)
   at pi (react-dom.production.min.js:186:166)
   at ck (react-dom.production.min.js:269:357)
   at bk (react-dom.production.min.js:250:341)
   at ak (react-dom.production.min.js:250:277)
   at Tj (react-dom.production.min.js:250:138)
   at Lj (react-dom.production.min.js:243:146)
   at react-dom.production.min.js:123:110
   at push.exports.unstable_runWithPriority (scheduler.production.min.js:18:336)
   at gg (react-dom.production.min.js:122:318)
   at jg (react-dom.production.min.js:123:61)
   at ig (react-dom.production.min.js:122:428)
   at Jg (react-dom.production.min.js:237:147)
   at Object.enqueueSetState (react-dom.production.min.js:133:211)
   at TimelinePanel_TimelinePanel.push.C.setState (react.production.min.js:12:356)
   at onLoaded (TimelinePanel.tsx:1279:18)

(spawned from #22157 (comment))

Outcome

What did you expect?

Message with reaction would load

What happened instead?

The tile error boundary was shown in place of the message: Can't load this message (m.room.message), Submit logs

Operating system

Windows 10

Browser information

Chrome Version 101.0.4951.64

URL for webapp

https://develop.element.io/

Application version

Element version: 479d4bf-react-5348572439be-js-4d4d6e1411b6 Olm version: 3.2.8

Homeserver

matrix.org

Will you send logs?

No

[t3chguy]

Nothing in that stack says anything relating to threads, what makes you so sure for A-Threads and that it can't be reproduced in the main timeline?

[MadLittleMods]

@t3chguy That's where it was reproduced. I don't know if the root cause is related to threads.

[t3chguy]

Same cause as #22141 - missing room object in store