card projects disappear, recombine, duplicate or generally get messed up

[grinapo]

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Describe the bug
Card project assignments (or call it linking) get messed up all the time. Projects simply disappear, or get duplicated, or pop up on a different card. May re-appear on full reload - or not.

To Reproduce

1. create two boards
2. create cards in one
3. assign various project types to cards, one at a a time
4. click on cards: projects may or may not be there
5. select other board
6. get back to the first board, cards now lose their projects with high probability

Expected behavior
Projects stay the same when assigned.

Screenshots

Client details:

• OS: linux
• Browser firefox
• Version NC 21.0.1.1, deck 1.3.2
• Device: desktop

Server details

Operating system:
debian

Web server:
nginx

Database:
mariadb 10.3.27

PHP version:
7.3.27-1~deb10u1

Nextcloud version:
21.0.1.1

Logs

Nextcloud log (data/nextcloud.log)

nothing

Browser log

.../collaboration/?format=json is retrieved when opening the deck. it looks to be in good format but contains random order or nothing.

[grinapo]

I went away, clicked in other decks, came back and it's now:

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[varac]

I also experience duplicate cards. When I'm offline and add a card, it will appear 3 times after syncing when online again.

[juliusknorr]

As the projects feature is superseded by related resources since Nextcloud 25 there are no plans to further work on this. As long as the feature is still there anyone is of course welcome to provide fixes through pull requests but I consider this part no longer maintained.

https://github.com/nextcloud/server/blob/stable27/config/config.sample.php#L2347-L2352
nextcloud/server#28320