User id shows instead of user name in comment thread title

When a user is mentioned in a comment thread using @, internally the user is referred to by their user id number. The comment is displayed using their user name, but the user id behind the scenes means that if they change their user name, the name shown in the comment stays up to date.

This works well in the comment itself, but currently it is not handled when the title of the comment thread is the default (the first few words of the comment). In this case the comment shows the user name, but the title shows the user id number:

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User id shows instead of user name in comment thread title

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