One more oddity to add to the mix: Premiere misinterprets the TS video of the Blu-ray, so I have to apply a LUT to correct that error. Interestingly, the error (and solution) are both applied at the render stage, so presumably there’s no loss of quality. I found a description of a similar problem online, this time with Fraps: https://encodingtalk.com/threads/encoding-fraps-videos-solving-colorspace-issues-wrong-color-faded-etc.1537/

Almost every render setting incorrectly interprets the video, giving it a purple cast and stronger greens, except for SD DVD output and untouched Lagarith codec AVI. If I later use different encoder on this correct Lagarith AVI, it incorrectly interprets the video anyway. So most video comparisons (for example, on Vimeo and Youtube) suffer from the added purple cast of this incorrectly interpreted video stream.