HDR Broken?

Did one of the recent PMS updates break HDR?

Played an HDR file for the first time in a while, and it only played in SDR on my nVidia Shield and on my TV’s own Plex app.

This, and other HDR files, played in HDR fine and dandy a few months ago.

I haven’t changed any settings on my NAS, Shield, or TV. And HDR still works fine with Amazon/Netflix/etc.

Any idea why my HDR mp4’s aren’t playing in HDR anymore? Thanks.