(Beta) Color issues with Dark Mode in Excel

I just downloaded the insider update that allows for a full dark mode in excel.   A couple of things I've noticed:

Black and white are inverted.  If you select black for a font color, cell fill, or border color, you'll end up with white, and vice versa.   If someone is in dark mode, they're going to get awfully confused when they try to change various colors of the cells they're working in and aren't getting the color they want to pick, especially for those who need to use specific colors in their spreadsheets for whatever reason. 

This isn't so bad with black and white; annoying as it is, you can still at least remember to choose black when you need white or white when you need black.  But when you choose other colors, you often end up with a color that is vaguely in the family of the color you selected, but not really.   Trying to select the standard yellow used for highlighting, and you end up with an almost pale gold-like color.   An example of what happens with a few colors is shown in the picture, but every color is affected to some degree.   This makes the dark mode feature almost entirely useless for those who rely on colored conditional formatting in some or all of their spreadsheets, as the colors selected in dark mode end up being completely different from the color you actually wanted to select, and it's nearly impossible to try to figure out which color you have to select to get something that even resembles the color you actually want.  

The colors of individual elements of a spreadsheet (Font color, highlighting, borders, etc.) should not be altered this severely based on whether or not dark mode is turned on.