Using older versions of Outlook for Mac for personal email and calendar
Hadn't seen wide reports of it, but have one person I support who has reported it. What worked for a while was switching to the legacy/old interface and composing/replying to an email and inserting an emoji. You could see a 'pause' happen but it worked. And subsequent tests, the emoji call up worked fine (no delay). Switched back to the new interface and the problem was fixed as well.
I was just researching the problem again and found this thread because the problem happened again, so hoping the same 'fix' as before works.
This person is on macOS Ventura as well.