When marking mails with the built-in mail-categories and flagging them, they appear in the task-list. “Blue” now shows the mail-symbol and the text in blue color (like in the mail-list), “yellow” and “orange” shows only the icon while the text remains in it’s regular color (white in the Dark-theme). This is at least an irritating inconsistency 
Hello Andreas,
thank you for reporting this, could you please provide screenshots so we can look into these inconsistency?
Thank you,
Regards,
Olivia
Both are one of the 6 default colors / categories