"brightness value" is missing in EXIF after converting ARW to DNG (and deepPRIME)

I just noticed this. In Lightroom, I see the original ARW has an EXIF “brightness value”, whereas it’s missing on the DNG file that PureRAW produced. So far it seems to be the only EXIF value missing.

Anyone else seeing this?

Hmm, I never noticed that before. The Brightness value is missing from the Photo ID in EXIF for the DNG, but is still present in the Sony Maker Notes. I have no idea why.