Preamble: I have no idea about the fineries of tone mappers, but this seems a little on the weird side and even if it's intended, it's not ideal.

The Khronos neutral tonemapper upper end is a little odd, making the sun on most sky settings without a very subdued sun turn into a peach-colored disc with a sharp core. It's like the saturation and luminance curves have very sharp steps in them at high HDR, resulting in the glow around the sun first getting extremely saturated, then the luminance steps up sharply and results in a "core". The effect is less pronounced at higher sun angles, but especially sunsets/rises look off. Basically the sun color needs to be below 50% luminance to avoid the oversaturation and core-forming, but that requires more ambient light etc. to compensate scene brightness.

Is there something that could be done to avoid the saturation-blowout of extremely bright light sources or is retooling even PBR-aware settings required once again to avoid a peach sun?

Comparison images have old mixed-ACES on left, Khronos on right.