Oh, since it is also a 'word link' type issue this may relate or help solve the problem.
@retired1
I've been having a terrible time trying to tag people lately.
I can start the tag with the first couple letters of the member name and get the dropdown list s usual...
I make my selection and get the usual....
But when I touch the space bar or start entering the next word this happens...
The only to avoid it is to hit that double space(?) Arrow in the lower right corner of my keyboard. Then use the backspace to go back to the text and finish the message.