group-chat vanishes from conversations-list after joining via invitation-link

[MoonyCarolin]

Steps to reproduce

1. Open a *.docx-file, which is stored on the nextcloud instance.
2. Klick on the link to a groupe chat of talk, which is stored in the docx-file.
3. Observe that you join the groupe-chat.
4. Leave the groupe-chat.
5. See the groupe-chat in the list of your conversations on the left in the talk-app.
6. Observe that after a few minutes, the groupe-chat disappears from the list of your conversations.

Expected behaviour

Expected was that the groupe-chat stays in the list of conversations.

Actual behaviour

The groupe-chat disappears from the list of conversations so that it would be necessary to join the chat over and over again to see what people are writing.
Staying in the group-chat seams to be possible if an admin adds the member.
It seams not possible to join the goupe-chat by searching for it via the "search conversations or contacts"-field.

Browser

Mozilla Firefox 75.0 (64-bit)
Operating system: Windows 10

Talk app

Talk app version: 8.0.8

[nickvergessen]

That is a recently common misunderstanding of how we imagined public calls should work.
Ref #1763 and #2784

I will close this as a duplicate.