Dark theme changes course color options

[jap21d]

Having used the dark theme on the iOS version of Canvas on both my iPad and iPhone for two years now, I noticed today when trying to change course colors for my upcoming classes that there are certain color options that are suddenly unavailable with the dark theme (e.g., bright red, dark green, etc.). I used the dark theme all semester and was able to pick colors for my courses that are now no longer showing as options. Is this a bug, or is this intended behavior? If intended, is there any way to bring the colors back? I have attached screenshots to this post for further clarification as to what I mean. Thank you in advance for your time and consideration.