LE13 includes a kernel patch that caps the Intel GPU driver to 10-bit output which is another way of achieving the same functional limitation as the sky42 script; although the script also effects a reset of the DRM connector and that might be a workaround for other problems.
Using the Beelink N150 box that I acquired for testing; without the patch I hear audio dropouts in most 4K HDR (and HBR audio) media, and with the patch I don't hear dropouts. I've not had issues with no-audio after playback end. I've also not seen any issues with blank screens after playback. I sometimes see blank screens during early stage boot but that's on multiple hardware platforms and I think nothing more than fast booting and slow (enough) HDMI handshaking with the AVR.
It would be interesting to see a clean pastekodi log (with Kodi in debug mode) that demonstrates the audio and/or video dropout after playback end.