Answered
Illustrator CC 19 GPU preview change the color
When i use GPU preview colors changes dramatically.
MacOS High Sierra 10.13.6, RadeonPro 580, Illustrator 23.0

When i use GPU preview colors changes dramatically.
MacOS High Sierra 10.13.6, RadeonPro 580, Illustrator 23.0

If it was working correctly for you last version then it may require updating the video card. If that is not an option for you then, as I said, it can be easily turned off.
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