Yes, dump1090-mutability ver 1.15~dev on Stretch has a problem of missing rtl-sdr.rules and requires a workaround.
I have posted the workaround in post #75 of FR24 thread which you and @Dxista have mentioned above. Here is the link to that post:
I have also posted it in Flightaware forum here:
When is STRETCH coming to PiAware SD card image version - post#9