• KOReader version: latest
• Device: Cervantes 4

Issue

Night mode doesn't work, probably since koreader/koreader-base#1047, as it used to work fine months ago.

Reported in https://www.mobileread.com/forums/showpost.php?p=3963993&postcount=11:

when I switch to "Black Mode" in koreader, only the colors of the pictures are inverted. The text remains in black color against white screen