No one among the Jedi knew Darth Bortles was a Sith except Sol.

Vernestra may suspect, but she doesn’t have to tell anyone.

Not every fallen Jedi who uses the dark side is a Sith.

There is no issue with the canon.

Well, if anyone was going to be a K-A-M fan, it’d be Grandpa “my forehead transplant donor was Cerean” Simpson.

Everything is cannon and conflicts can always be explained by the warp sith meddling.