I had a dreadful manager. I had to fight a lot, but I managed to move to a new manager. I am very happy with this person, one of the best managers I ever had. We lost a very senior manager, and my previous manager, who was in a more limited role but has been in the company the most, is covering "ad interim"... for 12-18 months. Now my old manager has effectively become my skip-manager, and he has been putting pressure on my new manager to take me out of meetings, exclude me from projects, and limit my visibility in general. In his new role, he was able to NOT promote at all a key strategic initiative which I have been working very productively on with my new manager, effectively hiding our initiative from senior execs.
There is now increasing tension between me and my new manager. In parallel, my old manager managed to take a team member away from my current team citing "emergency due to covid".
This is a nightmare, and I don't know how to fix it. Soon my manager will try to get rid of me, because of the pressure.
I want to protect my new manager, but I don't know what can be done.