QuickLook environment probes are always much too dark

It seems that on iOS 13 & 14 environment probes are notably too dark, and never reach an acceptable brightness that matches the surrounding environment.

Is there any way to get "reasonable" IBL lighting in QuickLook that is not like 50% gray all the time, without resorting to hacks such as using emissive colors/textures? Clearly there must be something wrong with the IBL estimation, as the same scene in Google SceneViewer is very bright and nice under the same circumstances.

The issue reproduces for example with the QuickLook gallery; the ceramics piece there is nearly 100% white as per the USD file but renders dull and gray next to a physical ceramics piece.

Video of the issue:

Code Block 
drive.google.com/file/d/14mVQFTNe6pO_4tYNIvpZa9eAS2YzoVPO/view?usp=sharing

More pictures:

Code Block 
drive.google.com/drive/folders/1ej6g-gpBAu53z2Zn08eQFNZAkTmDA_XJ?usp=sharing

Note that in those pictures, all spheres in that grid are purely white, with varying degrees of metallic and roughness being the only difference. My expectation would be that the diffuse ones would appear "white" and not dark grey; seems impossible to get a "realistic" picture.

Happens here as well:
https://developer.apple.com/augmented-reality/quick-look/models/cupandsaucer/cup_saucer_set.usdz