I've installed LE 8.90.006 on a Coffee Lake NUC (NUC8i3BEH) and keep getting glitches in the audio for DTS-X MSTR and Dolby TrueHD tracks. I've enabled audio passthrough for all formats and I'm connected to a Marantz SR6010 AV receiver with HDMI 2.0. The glitch is a minor pause in the audio track that sounds like a small click. This doesn't seem to happen with DD5.1 or regular DTS tracks. And of course if I disable the "Allow passthrough" option it works ok.
Here are the logs when I play a simple DTS-X sample: