Sorry for cross posting, but this issue belongs to 3.08 TEST 6 version too...
Using default setting (16-bit float) for environment HDR texture is not enough in some cases:
That scene issue seems to appear when environment HDRI have large dynamic range (Here the https://hdrihaven.com/hdri/?c=clear&h=flower_road free HDRI was used, 16384x8192 version, with dynamic range 20EVs).
It will be nice to have some kind of warning (if possible) when such images are loaded into scene, something like 'Selected HDR image mode will clip some values'.