kscreen-doctor -o
Then adjust the below command accordingly : kscreen-doctor output.1.hdr.disable
Make sure you go open a bug report.
When you do, you can use hw-probe and run : sudo -E hw-probe -all -upload -dump-acpi -decode-acpi
And use the given link in your BR.
I see you got it fixed.
When you run hw-prope make sure your offending monitor is connected. hw-prope will help identify the monitor by hardware ID which is used in various areas like kernel space and will help with identifying the exact model of the problem monitor hopefully allowing for devs to reproduce the bug in a lab environment.
Looking through the probe logs, and seeing that your monitor is using EISA bus and works fine without HDR, there doesn't appear to be any issues on the Linux side of things. My guess is that they didn't implement HDR on the monitors side exactly to spec and that's where the problem resides. So, in this sense some monitor specific quirk fixup code is needed on the Linux side of things to get it working properly. If the devs ask any additional steps from you, be sure to do it and provide feedback.