At some time today Roblox item thumbnails have become really bright. This is a big problem for us as we have about 500 items we need to upload today, however we don’t know if this is intentional or not.
Pictures of old thumbnails (from earlier today):
Pictures of new thumbnails (uploaded just now):
Example of new thumbnails on an asset by a different creator:
Expected behavior
We expect items to look like they aren’t 1ft away from the sun.
We are making some intentional changes to make thumbnails a bit brighter overall, with better support for specular highlights on some items with PBR, but I agree this does look too bright.
I’ll revert the change and invalidate the thumbnails for these assets so that they are re-generated with the old lighting.
That was my exact speculation! 
Thank you, can you let me know when the change is reverted so we can continue uploading.
The change has now been reverted, I also invalidated any thumbnails generated today, but due to caching it may take a while to see this reflected in existing items (up to 24 hours).
I noticed the same problem yesterday, not only were the items too brightly lit but the light was also a bit bluish giving a blue tint to the white colors, which doesn’t look good (items ID: 79797498179024 and 106384465583678):
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