Color settings no longer what I expect them to be

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I updated to Genesis 3.1.2 and did some other things and now my colour settings have gone all blue. Why?

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Fortunately, if I don't change a paragraph block that does have a (what was) valid value for a background colour then the front end is still OK.
Colours I'd used are: light-green-cyan, luminous-vivid-orange, luminous-vivid-amber and none selected... which means that the padding is lost.

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Note: The genesis-hm theme is correctly displaying the colours I'd selected for that ( s.b/hm )

And the genesis-oik theme is showing the original colour set (s.b/oikcom and s.b/wordpress )

So it should be an easy task to find out what's gone wrong.

In all sites, the parent theme is Genesis 3.1.2

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I know where the main bug was introduced. If I revert to v1.3.0 then the palette returns to normal.

... Except Vivid Purple is missing. 11 colours rather than 12.
Now I want to know where that's gone?
Answer: This new colour was added in Gutenberg 6.3.
See WordPress/gutenberg#16833

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It would appear that the default editor-color-palette array is not available in core PHP code. The Kadence blocks plugin builds its own default array in Kadence_Blocks_Settings::load_color_palette
So I'll copy and cobble that.

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I'm also going to add "White". I can kill two birds with one stone here.

1. When selected as the Text colour it'll provide better contrast than Light grey.
2. When selected as a Background colour the block will gain the extra padding associated with the has-background class.

.editor-styles-wrapper p.has-background {
    padding: 25px 30px;
}

This will potentially resolve a problem I've encountered on the home page where text styled with a white background is obviously different.

The downside is that the "color combination" warning can appear where it previously didn't... even though the background colour was by default white.

And we can only wonder what those two messages about backups and autosaves I should believe.