Using HDR Tools and Keyer crops out bottom of video

I'm having an issue using HDR iPhone 13 video with FCPX and was hoping someone could help. I'm trying to create a video using greenscreened/keyed HDR footage and I'm having a weird problem. When I use HDR Tools and Keyer together, it crops out the bottom ~40% of the video. I have no idea why.  I've attached a few screengrabs to show what I'm talking about. I included grabs of:

1) The raw video without HDR Tools or Keyer
2) The video with HDR Tools only
3) The video with Keyer only
4) The video with both HDR Tools and Keyer

I've looked everywhere (I think) for any accidental cropping but I can't find anything that seems wrong. I've tried this with multiple HDR videos from my iPhone 13 and the results are the same. Have I done something wrong? I'm very confused..

Details:
FCPX 10.6
Macbook Pro M1
MacOS 12.0.1

And if you put an image underneath it it becomes even smaller. It's much worse in standard 16:9. If you reverse the stack order in the Video inspector, Keyer first, then HDR Tools, it seems to work. Definitely report it to feedback because the behavior doesn't seem correct.

I was having this same issue and couldn't find any answers. I kept removing and playing with the HDR tool & Luma Keyer...
The solution (that actually worked for me) was to change the projects Color Space from Standard to Wide Gamut HDR Rec. 2020 HLG. Then i removed the HDR tool and was able to maintain the Luma Keyer. The bottom half of my video is no longer black/missing and i think ive resolved my error. Exporting now, render files look great. Fingers crossed 🤞