Just had sunset half an hour or so ago (UK).
As we reached sunset, and for about twenty minutes after, the colour (color) gradually reduced in blueness, warmed up, as you would expect.
Then, suddenly, it went back to full midday blue-white.
This was happening on Big Sur to some extent, but it seemed stronger, felt like someone flashing a light at me.
Oddly, almost exactly the same has recently been happening on a Windows 10 machine I use...
ADDING:
About an hour after sunset, the blue daylight colour slowly went the right shade for evening use.