I am also facing these issues on my honor play.I am using Huawei Honor Play on EMUI 9. The theme is almost perfect but I found little bugs here and there (even after restarting the phone). The biggest one is this. I can't see any text in these areas (I could still use it but the USSD request screen is unreadable too), white background with white text. Please fix this and this will probably be my permanent theme till EMUI 10.
Its Deep Black EMUI 9 Theme not mate 20 board