That's a PM looking for a promotion and I'm afraid that it can't be helped. It's not the only way, somebody they get promoted without doing anything, only backstabbing other people.
In a sane environment there should be user problems to solve, real problems and not invented ones, and teams that solve those problems. The PM of a team delivering the best solutions should have an advantage when looking for a promotion, that's fair. Unfortunately that means that they had a brilliant PM and they'll turn it into a maybe mediocre manager one level up and there is no way to climb down the ladder in the same company. Peter's Principle.
In a sane environment there should be user problems to solve, real problems and not invented ones, and teams that solve those problems. The PM of a team delivering the best solutions should have an advantage when looking for a promotion, that's fair. Unfortunately that means that they had a brilliant PM and they'll turn it into a maybe mediocre manager one level up and there is no way to climb down the ladder in the same company. Peter's Principle.