@mention from an Activity Entry notification mail

Please correct the @mention in activities updates' mail notification.

1. Create an Activity. (Standalone or Community one, it does not matter)
2. Add another user as a Member.
3. Create a new Entry.
4. In the Description field, add an @mention for the other user.
5. Select "Notify people of this entry" and then "All individual
members of this activity Notify all help popup".
6. Open the notification mail that is sent.

OBSERVED RESULT:
The Description in the notification mail contains garbled text instead of the @mention.
For example:
@{{9ab0e6c6-fb2b-4aec-940b-e3989276e4d2|@test%20User}}