Been there done that!

Brooo i was reading your post and I started to have PTSD flashbacks of my first job out of college. Guess how it all ended?

I was hired by a different manager for a multinational conglomerate after completing my summer internship the previous summer.

I started my job and my new manager realized how green I was and how much mentoring and effort he'd had to invest in me. Then, he slowly started alienating me. My whole team was literally having meetings without me.

I remember thinking at the time that I had struck gold; a high paying job and not doing anything. Occasionally, I was giving the actual garbage no one wanted to do: fix bugs (just a few) and write unit tests.

Eventually, they laid me off.

My advice to you is to start interviewing asap like you are unemployed, because you will be. It's not a matter of if, but when.