Changed lights behaviour from v135 -> v136

I have been working on Threejs v135 for long and decided to upgrade to v136. As per the migration guide changed the type for rGBE loader from UnsignedByteType to HalfFloatType. Still, I find a difference in both the visuals. I guess it is due to either how lights are rendered or textures are rendered internally. All the other configurations remains same.

Scene Config as below,
Environment Map: none,
Ambient light : intensity 20,
outputEncoding: sRGBEncoding

Can somebody explain the difference?

Please demonstrate the issue with a live example for comparison. A screenshot alone is not sufficient.

BTW: An ambient light intensity of 20 is way too high. Try to avoid such unusual values in your lighting setup.