Messages in threads on private channels are not visible for all users in the thread

[jschirrmacher]

Steps to reproduce:

1. I create a private channel 'js-test' and create a direct link to create a thread in this channel (as used by BusinessHub team)
2. Another user uses this link to create a thread - which works, he is member of this channel then.
3. He types some messages in this channel and sees this messages, I see them as well.
4. I answer back and see my messages too, but he doesn't see them.

Expected behavior:

The other user should see my messages too.

Actual behavior:

The other user sees only his own messages.

My screen

Screen of other user at the same time

[Morl99]

As just noted in your team channel, this is a high priority issue for us, as we need this feature to work as a replacement for the now missing requests.

[jschirrmacher]

Might be solved with #443 - at least, access to all messages is available, when the user refreshes the page.

[ThomasRoehl]

A workaround is to refresh the page.

[jschirrmacher]

Confirmed that the problem is solved with #443