Is your platform of choice Android? If so, there’s a bug where lightmap compression is clamping HDR values. See: [ANDROID] COMPRESSED HDR LIGHTMAPS ARE NOT ENCODED
See if disabling lightmap compression (in lightmapping settings) resolves the issue. If it does, then you’ll have to not compress, use a different compression, or wait for the fix.
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PC, just tried your suggestion, no change. Thanks though, compression killing extra bit for HDR lightmap would make sense.
HDR color values were not taken into account when baking environment lighting. This is a known issue that has now been fixed: Unity Issue Tracker - HDR values are not taken into account when using baked gradient environment
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fixed in which version?
“Fixed in 2019.3, 2020.1” (taken directly from the page that @kristijonas_unity linked to).
If you are on 2019.3+ and still experiencing issues you can also try changing Lightmap Encoding in Player Settings.
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