I plugged a USB optical drive in to my RPi3 with LibreELEC 9.2.1 and I couldn't get either kind of disc to work. Even tried a different external drive for DVDs and that didn't work either. I logged in via ssh and captured debug logs for each attempt.
I have KEYDB.cfg in the proper spot for Blu-ray. I see some data in the .dvdcss directory when I try to play a DVD. Something else interesting is I don't get a Disc menu appearing after I insert either one.
DVD Attempt:
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Blu-ray Attempt:
External Content
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Perhaps I'm missing something obvious?