"add participant" list not showing all results

[mahibi]

Steps to reproduce

1. go to conversation settings in a group where you are moderator
2. click "add perticipant"
3. click search icon
4. search for a participant

Expected behaviour

all results are shown immediately

Actual behaviour

maybe there are shown results, but they are incomplete.
often a participant that should be shown by search criteria is not shown.

when deleting the search phrase and type it in again for a second time, the participant is shown correctly (at least when i tested it)

Nextcloud Talk app version

15.0 RC3 (and most likely lower)

[Smith-fms]

I found a similar error today. Many of the user groups are not being displayed. Therefore, I can only find a fraction of the user groups that have been created. This error is very, very annoying, and unfortunately, the workaround does not work here.

[mahibi]

whatever causes this issue, there is a good chance it's fixed whenever #3794 is done