Expected result: There is a dot next to the channel in the sidebar, on the header icon and on channels in the menu where you switch between DMs and channels. Actual result: Without looking at the channel there is no indicator that there is an unread chat message, which is even more problematic because someone was directly replying to you. You are notified better about someone posting something than about someone replying to you
Thanks for reporting it! one additional note is that this is a client/server mismatch… if I keep the same window open and open a test user in a different browser, the notification dot can appear, but it goes away on refresh despite not changing the read state. Impersonation effectively causes the same behavior as the refresh.