Hello,
I noticed Scale Time would always set the fixed timestep to 0.02 * timescale no matter what. Even if "Adjust fixed timestep" is off, and the 0.02 is an arbitrary value hard-coded into the action. It seems the action is unfinished. I found this offending code in it:
//TODO: how to get the user set default value?
Time.fixedDeltaTime = 0.02f * Time.timeScale;
In my build, I will just modify the action to remove this line (I don't need to adjust fixed timestep at all), but I thought you might want to know the action is currently broken.