Installed smoothly (using the existing TWRP 3.3.1-0). 
First second impression: I’m suddenly getting to hear – certainly all normal – regular feedback sounds I didn’t use to hear under (my) LineageOS 16 installation.
Next observation: Display will go to sleep after one minute, but wakes up again after 7 seconds (happens both with cable connected and without only). Please note: I always had a similar issue before (under LineageOS 16) as well that no one else here seemed to have: Display would only dim, but never fully go off when cable connected (did not happen then with cable off). Manually switching (button) the display off works without re-awakening.