Anyone else notice a change in how transparency is handled in the LoRA trainer?

Was tagging for a LoRA and noticed that auto-label had given a bunch of images with a transparent background "black background". I'm pretty sure before it would always slap "white background" on transparent background images in the past. Was it unusual set of images? (I also recall that images with transparent backgrounds were shown as white backgrounded in the trainer and you needed to right click+view image or check your notes to know which were transparent, but I'm less confident on that). It wasn't even that long ago that I saw it think transparent was white.

If I'm not going crazy/getting a really unusual set of images, It's not a bad change (but not a good change: It should recognize transparent as transparent) though I haven't seen anything documented and it indicates something changed.

(I'm not even sure if the trainer should be told transparent background is transparent or if it will see them as black/white)
Edit: Per John_KSampler in comments, this may just be due to the way the images I had stored their transparency and not a site change.