This change is deliberate.
We used to create users per language model, this is very confusing and was very hard to explain.
Instead we now create a user for every AI agent that has AI Bot enabled. This is a far easier to explain state of affairs.
You have a user for “forum helper” cause you are allowing users to talk to “forum helper”
I know this was disruptive, but at least the current new state of affairs is a lot easier to explain.