I've been running LibreELEC-TinkerBoard.arm-8.90.014-rk3288.img.gz for the longest time, recently upgraded to LibreELEC-TinkerBoard.arm-8.90.015-rk3288.img.gz. Noticed pass-through audio broke in between version. For now I have reverted back to LibreELEC-TinkerBoard.arm-8.90.014-rk3288.img.gz. Just wondering what changed that broke things, can not find a changelog. I suspect it has something to do with CEC since CEC seems fixed in the latest release.
Ran LibreELEC-TinkerBoard.arm-9.1.002-rk3288.img.gz as well, and it seems to have broken Audio pass-through.