It happen to the all hdri that was not tone mapped and have low info and are over exposed, my light probe is 90 MB
created from 5 raw image files that total are 450 MB of data ... 20 MB for a hdr is very low mean not much inside.. Dosh sell own hdri for systems that works different way as Poser..

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"Surrender to what it is - Let go of what was - Have faith in what will be "