Palette not correctly managed in twenty twenty theme

Hello,
We are using this plugin in wordpress.com twenty twenty theme with Gutemberg editor.

The plugin work well and we have add 3 colors to default theme colors.

The problem is the 3 colors added in the plugin are never shown in the Gutemberg Color Palette ( neither in the text color optiond nor in the color options of the background ).

But if we set a custom color in the Gutemberg editor ( manually with the custom color windows ) if this new color has the same HEX value of the color added in the plugin the CSS code it with the same slug coded in the plugin.

So, the problem seem to be only to show the entire palette in the Gutemberg editor ( standard + custom colors ).

Thank you for help.