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Summary
A specific user is in several channels, but when someone mentions them by @username they see a bogus message "username was mentioned, but they did not receive a notification because they do not belong to this channel."
Steps to reproduce
Has occurred since upgrading from 3.2 to 3.5. Conditions to reproduce are otherwise unknown.
Expected behavior
Since the user is in the channel we do not expect this message to appear, and we expect the user to get a notification.
Observed behavior
Observations:
- username is correct in the user's account settings and in the database
- user is shown as a channel member and is in the ChannelMembers database table, and has many posts in the channel
- autocomplete of the username works fine, and shows the user as in the channel
- using other mention words seems to work as expected - only the username has this curious effect