If I import a TIFF sequence into PremierePro it fails to use the color management engine and it just seems to just automatically treat the files as sRGB (in much earlier versions of PremierePro before it barely even did color management at all it seemed they were auto-treated as REC709) even when the files are actually ProPhotoRGB or REC2020 or whatever and the files were saved out with Photoshop as having an ICC profile (and load fine back into Photoshop or into other color managed programs). Far worse, it won't even allow one to manually select the proper color format since the whole interpret footage color management section is grayed out for TIFFS! How come the override section is grayed out in the very scenarios when it is beyond critical, the scenarios where PP seems to try to assume that you just want sRGB (or REC709) as the file colorspace, whne it guesses it doesn't let you over ride but then, see below, when it doesn't guess it will let you over ride. It should let you override no matter what, but this way seems worst of both worlds, where you can't override when it guesses. So there is no way to even manually get around this bug (which seems to be here for years) where it fails to bother to apply color management to TIFF imports (even though it does for other formats like PNG).
If I make a PNG sequence instead then the ICC color profiles are read in and it show sunder properties the proper colorspace (for TIFF import it doesn't even list a colorspace when I choose to look at the import's properties!) and the whole interpret footage section is available (not that I even need to alterate in this particular case).
However, it is very annoying to not be able to use TIFFs instead of PNGs as PNGs take so much longer to write out and read in and I'm dealing with tens of thousands of frames so being able to use TIFFs would save colossal amounts of time. I'm using PremierePro 23.3.0 (the last version of PP that both does not crash out on startup, as the last few versions that run on my CPU do, and still runs on my CPU) on Windows 10. Although the same bug for TIFFs not getting the color management engine applied seems to have been here for at least a year or more, perhaps much longer back.