This is more of a performance issue than a bug, but I'll report it anyway.
For this test I've taken it to the extreme by duplicating a object containing 7 FSMs each about a 1000 times in the scene. Each FSM have about 10 actions in them.
When I add a new FSM to any object, doesn't matter which, it takes a very long time for it to go through the process. It's as if it iterates through all existing FSMs in the scene for some reason (and potentially FSMs in prefabs?).
It's concerning for projects that are getting bigger in the long run, not so much for smaller ones. With a bit of logic it can be avoided, but would be great if things could improve here.
Video:
https://www.dropbox.com/s/pxzddcx2zcm6rvv/fsm-performance.mp4?dl=0In the end of the video I deleted all the prefab objects in the scene, which resulted in adding FSMs much faster.
unity 2020.1.14f1
PM Beta 1.9.1p5