I updated to 0.18 Q today from 0.17 Q on a Moto G7 Plus.
The only issue I’ve discovered is that the numbers on the in-call dialer are invisible (white font on white background - while in a call, open the number pad0. The corresponding letters appear fine, just the numbers are a problem.
dark mode = clear background, dark-grey numbers, no letter seen,
clear mode = letters, no number seen.
e-0.19-q-GSI, clean install:
dark mode = green numbers, no letter,
clear mode OK (like first screenshot above).
Édith: clean install of e-0.19-q STOCK (format data etc., then adb sideload, from e-0.18-q-surnia OTA, config’ only Locales, no account) on my second surnia device : same results.