Room permissions not correctly sync'd

[matrixbot]

This issue was originally created by @Undef-a at https://github.com/matrix-org/dendrite/issues/2142.

Background Information

• Dendrite version: 0.6
• Monolith or Polylith: Monolith
• SQLite3 or Postgres: Postgres
• Docker: no
• Go Version: 1.16.13 (Fedora)
• Client used: app.element.io and Fluffychat

Description

• What is the problem: User power levels are not synchronized between Matrix.org and the Dendrite homeserver correctly.
• Who is affected: Users in some (not all) rooms on the dendrite homeserver. Matrix.org users see the correct permissions.
• How is the bug manifesting: Specific rooms show a given user as "Admin" to accounts on matrix.org and power level 0 on dendrite.
• When did this first occur: Using 0.5.0 but I was unable to capture an image of the bug.

This may be related to #2129, but it manifested before upgrading to 0.6.

The relevant part of the userlist of an affected room:

[matrixbot]

This comment was originally posted by @neilalexander at https://github.com/matrix-org/dendrite/issues/2142#issuecomment-1032416466.

Can you please see if things are any better on commit a2b4777?

(The updated power level events may not appear straight away, you may need to wait a little bit.)

[matrixbot]

This comment was originally posted by @Undef-a at https://github.com/matrix-org/dendrite/issues/2142#issuecomment-1033611522.

No change after 24 hours with that version. I'm now on db6f8bed and will report back whether that fixes it eventually.

EDIT: I can confirm that permissions are now right after a message was sent to the room. Looks like this one is working.

[matrixbot]

This comment was originally posted by @Undef-a at https://github.com/matrix-org/dendrite/issues/2142#issuecomment-1037518740.

Permissions have stayed correct for a few days now. Thanks for the fix.