DeckLink will not display FCPX HDR
I use a Blackmagic DeckLink with HDMI to a HDR TV to edit HDR. This displays HDR when editing with DaVinci Resolve but it only displays SDR when editing with FCPX. The TV indicates it receives HDR from Resolve, but not from FCPX. This is from a 2020 PQ timeline in FCPX, and the A/V output is set to the DeckLink.
iMac Pro
macOS Catalina 10.15.6
FCPX 10.4.8
Does anyone else have this issue, or know how to solve it?