When I have Midnight Lizard enabled while using Google Sheets, if I try to use the color picker UI to change the color of a cell or text, the colors in the picker understandably colored differently than they would otherwise be in normal mode. However, if I then
disable Midnight Lizard or load that Sheet document from another device, it shows that the color that was saved for the text/cell was literally a different color and it retains that color. I'm guessing that the color picker might save the actual hex color value of the color selected, so this somewhat impacts functionality.
On a separate note, when enabling Midnight Lizard on Google Sheets after the page is loaded, it will often improperly darken elements resulting in too-little contrast between cells, text, and the background. A quick reload with dark mode enabled usually fixes this.