Server incorrectly responds with 200 OK to reaction removal, but takes hours to actually remove the reaction.

[RokeJulianLockhart]

Errata

As element-hq/element-web#28249 (comment) explains, the effect for the user is as the undermentioned describes:

Unable to remove reactions from messages after page refresh.

Steps to reproduce

1. Uploaded an MP4 H265 video file to https://matrix.to/#/!LdFTpgksHpQBBtjOMN:matrix.org/$7z9qoF17VHc08wg2mlG1fRYtfhXbHmhxp-ZNQCXcK-o?via=matrix.org&via=beeper.com.

2. Reacted with an emoji.

3. Attempted to remove the reaction.

   Outcome

   What did you expect?

   I should have been able to.

   What happened instead?

   I was able to.

4. Refreshed the page.

5. Attempted to remove the reaction.

   Outcome

   What did you expect?

   I should have been able to.

   What happened instead?

   I was unable to remove it, yet was able to remove others added subsequently:

   2024-10-20.12-56-42.mp4

Operating system

https://download.fedoraproject.org/pub/fedora/linux/releases/40/Spins/x86_64/iso/Fedora-KDE-Live-x86_64-40-1.14.iso

Browser information

https://fedora.pkgs.org/40/fedora-updates-x86_64/firefox-131.0.3-1.fc40.x86_64.rpm.html

URL for webapp

https://develop.element.io/#/room/!LdFTpgksHpQBBtjOMN:matrix.org

Application version

Element version: 249c0fd1df0a-js-88cf5eb76983
Crypto version: Rust SDK 0.7.2 (517d99b), Vodozemac 0.7.0

Homeserver

https://matrix.org/

Will you send logs?

Yes

However, what is actually occurring is the server is informing the client that its request for reaction removal is successful, despite the server taking up to multiple hours to actually remove the reaction. This is erroneous.

Meta

1. I have reported this to @matrix-org per Unable to remove reactions from messages after page refresh. element-hq/element-web#28249 (comment) - a recommendation to do so by a developer of the Element client:

   The server says the redaction is successful with a 200 OK, so is not something a client can reliably detect or deal with.

   I suggest that you read the thread. It is adequately concise, and explains better than I can summarise.

2. I have reported this at this repository because https://github.com/orgs/matrix-org/repositories?type=source&q=server didn't return any better results in +2024-11-06.