Hi all... I have this same issue
mac osx 10.14.5, unity 2019.1.10f1 Personal, PM 1.9.0.p17
I have an additional issue that is bugging me more... the focus on text fields on states keeps booting me out as I type, so I can only type 1 or 2 characters at at time. It makes renaming states next to impossible. This only seems to be happening in PM - the rest of unity works fine. Anyone else getting this, or just me?