Highlights has a cyan tint

if just one channel clips then the other channels contents remains but with changed relations. Then white balancing also affects those areas - and in an unbounded colourspace theres no white not affected by whitebalance. Then filmicrgb color preservation takes care that the color isn’t lost when bringing highlights back into the limited output colourspace
So you need to override filmic defaults since filmic doesn’t know about valid or invalid color input.

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