The same problem is being experienced by my colleague also using Ubuntu 20 Teams client.
And via web interface it remains the same. The same problem (under Ubuntu 20 - Google Chrome or under Windows 10 - Google Chrome).
As well as, the counting of replies for each thread is messed up. For instance, take a look at this thread with 8 replies:
When clicking on the link '8 replies from ...', you get only two replies displayed:
And when rolling up the 2 replies, the counter shows just 2 replies! :
A weirder sequence of actions from other thread: It has 32 replies, only 2 of them are visible, and after rolling up and down several times the replies counter shows 12 replies and finally 2 replies:
More tricky scenario: it seems to me that this errors only appear on certain channels, and not in all of the channels I'm subscribed to.
Don't really know if the problem is due to the client running under Linux, cause the same problem is via web interface (both in Windows and Linux environments), but the fact is that the client under Windows does not have errors...
Thanks!