Recently I was playing trying to reveal a hidden text in an underexposed area. Camera RAW could not show it while other programs including the Preview utility in Mac OSX and Luminar, Exposure, Affinity and CaptureOne did it without problems. I have always thought that Photoshop and Camera RAW are the parents, the origin of the other programs, so it is hard for me to take on this problem that on the other hand may not be so serious.
If I open the JPG file directly in PS and then I go to ACR, no problem the text can be seen moving some controls; but if I open the file directly in Camera RAW, it is not possible.
I'm a Mac user and all the software involved is up to date.
If it has been fixed, it has nothing to do with DocumentAncestors - which does not apply to raw files from a camera. That's an issue with excessive amounts of edit history metadata, bloating file sizes.
The problem with the black scaled profile is apparently that it interferes with normal Black Point Compensation - a standardized procedure that works very well when left to its own devices. I suspect the black scaled profile is intended to be used with applications that don't do BPC at all.