This bug happens when an Android phone kicks into Battery Saver mode. In this mode SN's PWA reloads and goes into Dark Mode if it isn't already.
Usually when a user has misspelt a word, the word is underlined in red and clicking the word brings down a list of suggested words. The words are written in black on a white background in both Dark and Light Modes.
However, when Battery Saver mode kicks in both the words and the background are black. The word list is there because clicking the list substitutes the bad spelling with a suggested word. Obviously either the word color or background color needs to be changed.
I've checked to see if it happens when using the browser that created the PWA on a phone. It doesn't happen when using the browser in the same circumstances.
Anyone else able to reproduce this?