Missing rooms: Caught /sync error Cannot destructure property 'type' of 'l.b.findIn(...)' as it is undefined.

[MichaelSasser]

Steps to reproduce

1. Log in
2. See: rooms vanished + the issues described in "What happened instead?"
3. Reset cache and reload
4. See: a different set of rooms vanished + the issues described in "What happened instead?"
5. goto 3

The issues are happening with the current stable releases of synapse and element web.

Log snippet

2022-08-15T12:02:56.720Z W Adding default global override for .org.matrix.msc3786.rule.room.server_acl
2022-08-15T12:02:56.735Z I Enabling encryption in !foo:michaelsasser.org
2022-08-15T12:02:56.861Z E Caught /sync error Cannot destructure property 'type' of 'l.b.findIn(...)' as it is undefined.
TypeError: Cannot destructure property 'type' of 'l.b.findIn(...)' as it is undefined.
    at T (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:795445)
    at h.setBeaconInfo (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:1204377)
    at new h (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:1202447)
    at v.setBeacon (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:301185)
    at https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:299101
    at Array.forEach (<anonymous>)
    at v.setStateEvents (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:298997)
    at c.initialiseState (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:478878)
    at C.processRoomEvents (https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:823811)
    at https://element.michaelsasser.org/bundles/2275d68530bbdc0832d8/vendors~init.js:2:819943
2022-08-15T12:02:56.861Z I MatrixClient sync state => %s PREPARED

Outcome

What did you expect?

See all joined rooms and have none of the effects below.

What happened instead?

• some rooms vanished
• some rooms show without room name and users
  
• some room versions are shown incorrect (e.g. a v6 room shows as v1 room)
• some encrypted rooms are unable to find the configuration event (I guess the
  m.room.registration state event)
  
• Spaces "fail to load list of rooms"
  
• Soft crash on space panel view, when trying to join any room (might be related to Soft crash on space panel view (unknown exact cause) - "Something went wrong!" error #22752)
  
• When joining rooms which were tombstoned, the element joins the predecessor room.

Operating system

Linux ms-thinkpad 5.18.16-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 03 Aug 2022 11:25:04 +0000 x86_64 GNU/Linux

Browser information

Chromium: 104.0.5112.81 x64

URL for webapp

https://element.michaelsasser.org

Application version

Element Web v1.11.3-rc.2 (d7f2eba-react-d7f2eba31074-js-d7f2eba31074); Olm version: 3.2.12

Homeserver

Synapse v1.65.0rc2

Will you send logs?

Yes