"Picture is better than 1000 words"
Selecting anything appends the JID to already typed text instead of replacing it.
Captura de pantalla 2021-05-14 a las 17.28.33.png
I think that macOS may think that the word to complete is the part after @, so just sure.im.
@
sure.im
That could be it. Nevertheless it looks like a bug :-)
This part is reimplemented in BeagleIM during adding support for meet.
meet
"Picture is better than 1000 words"
Selecting anything appends the JID to already typed text instead of replacing it.
Captura de pantalla 2021-05-14 a las 17.28.33.png