My bot has been configured properly a long time ago, before the new HTML5 chat editor was applied officially, after I found this bug I tried to unassign the bot power and restart the bot to see if anything would change but nothing happened.
The bot was still able to join the chat normally with the bot pawn, as if I haven't unassigned the bot power at all.
I thought it might take some time for the changes to apply and the bot detects an issue with the bot power, but nothing has changed, its been 14 hours now.
Unassign the power.
Restart the bot. (It will join normally with the bot pawn)