In all instances whereby the background is set to be out of focus, any character that is within that range and has patches, all the patches will be blurred. (Regardless of whether the character and all its layers are set or not set to scale compensation)
I'm sure this is something that can be recreated using a patched character (the patches are on the elbows and knees).
I am using ASP 11 32 bit mode,
My document is 1280 x 720
A character is set to -0.1095 in Z axis
Focus is set to 2
Focus range is set to 0.50
Max blur radius set to 17

I have to manually adjust the curves which is not ideal, and render out 2 different versions of the same file in order to workaround this. Or just blur and animate each background element via the layer panels - but this is time consuming and not always as convincing as a camera. Thankfully I don't use this feature a lot but it is quite annoying.