The forum is still going through a number of upgrades and some database updates - which takes some time due to size. Thank you for reporting the issue, I will check to make sure the Emoji functionality is restored once completed
It may be coincidental, the upgrade was planned for a while as we are mainly meaning to provide better tools to fight bots and moderate SPAM.
The behaviors you mention are indeed expected, we go through of a series of separate tasks targeting various areas and some functions of the forums need to be temporarily suspended until everything is ready. It's quite long, that's why we wanted to keep the forum (somewhat) operational