LSPCon - No HBR Audio - Same kernel, DP to HDMI adapter and HDMI hardware works with AMD

I am using Kernel 6.6.26 in Libreelec nightly build. Intel hardware is I3-8300 on Supermicro motherboard using Intel C246 Chipset. Working AMD platform is using AMD Ryzen 7600X integrated graphics on Asus X670E motherboard. The Displayport to HDMI adapter is identical in both cases; a Club3D CAC-1088 (VMM7100 chip) with recent 7.02.120 firmware. Upstream HDMI devices are identical in both cases.

With the AMD setup High Bit Rate Audio bitstream (eg. DTS HD Master Audio or Dolby TrueHD) works. With the Intel hardware there is no sound at all when trying to playback HBR audio bitstreams. Legacy Bitrate audio (eg. Dolby AC3/Dolby Digital or DTS) work fine as does multi channel PCM. Both platforms work fine in Windows.

I'm not sure what logs would help with this issue so please let me know what to provide. I can provide comparison logs from the working AMD setup and the non working Intel setup if that helps. I'm not certain this is an Intel Display driver bug but the fact the exact same OS and converter hardware works with AMD means it seems most likely to be an Intel issue.