I’m sorry if this is a known issue, but I’ve noticed that when I develop a photo with bright highlights, I get strange colors in the bright areas if I set the contrast to a negative value. Still, I found that if I set the Tone Curve mode or Base Curve to anything other than Neutral or Linear, or increase the White Point slightly, the colors disappear. The same thing happens to a photo without bright highlights if I brighten it with exposure compensation. I’m using version 1.21.1, which is the official Windows release. Version 1.21 was the same.
When I changed the highlight reconstruction to `Blend’, the colors disappeared, but very thin black borders were left. When I moved the contrast value further in the negative direction, the colors appeared again.
Interestingly, I hadn’t considered adjusting the highlight reconstruction settings before. It is great to learn from the knowledgeable community here!