Switching Theme deletes all Alternative Highlight Colors

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I can't save the Alternate Highlight Colors to the default theme, but if they are switched it simply drops any alternative colors you have.

This may be by design (due to not changing the themes). If so, it would be good to force a custom theme with prompting if alternative highlight colors are added. It's counter-intuitive to allow custom highlight colors that can't be retained. Maybe greying it out the alternative highlight colors section with a note that says "create your own theme to make and save alternate highlight colors" or something?

My take is that Alternative highlight colors should be able to be auto saved on creation to the Obsidian and Solarized options if they are active, so this would be a bug.