Hm... I tried to reproduce but on my test site it works perfect, all relevant users got an email. Also the differences between rc2 and rc3 give me no idea where it could come from.
Are there other differences?
Are there more messages shown as e.g. "1 user(s) deleted."?
Could you set JEM Settings - Global Parameters - Write Logfile to Debug or All and after re-test look into (/logs/)jem.log.php
In the evening I tried to reinstall your version 2.2.0 RC2 (master).
I found that the fault is also there.
FE: When the creator event adds (deletes, sends an invitation) -> mail, which belongs to the attendees arrives creators.
When a participant registers himself, so everything works. In Annex I send log.
even when the added as attending user comes on the waitinglist.
Only the administrator and as administrators added persons get the email.
EDIT: for to be more clear
the administrators get the right email (info als aufgelisteter Administrator)
and the email for the added person!
the added person doesn't get any email when added in frontend from the creator (in my case the administrator)
on JEM 2.3.0 stable in latest Joomla (3.9.22) Protostar php7.4.5
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