AI Chat、ユーザー名変更でメンションに反応しない

[sam (Sam Saffron)]

@Jagster

What was not expected is I can talk to newborn johndoe but it refuses answer unless I mention its earlier name johndoe_bot that does not exist anymore.

this is extremely confusing, cause the only user that exists and only mentionable entity is (5) johndo which would be this username:

Can you Chat DM this user?