[quietvoid]

Of course HDR10 files now start as DolbyVision but that looks fine for me.

That statement makes no sense, do you mean HDR10+?
If your TV doesn't support HDR10+, it doesn't matter.

[tRiBUN]

Of course HDR10 files now start as DolbyVision but that looks fine for me.

That statement makes no sense, do you mean HDR10+?
If your TV doesn't support HDR10+, it doesn't matter.

HDR10 not +. The TV shows DolbyVision, not HDR, has been started for these files.

[quietvoid]

They are already Dolby Vision, not only HDR10.