It would be far more useful when I rotated/flip/etc a part it didn't deselect, this way i can continue to act on the part. Its cumbersome to have to continually re-select it.
I filed a ticket for this, the engineering team will take a look at how difficult this change it to make.
It seems this is a intermittent bug. I reloaded the page and it seems to allow me to continuously rotate/flip after.