Version: 10.0-beta.6+3e7030a64 (64-bit)
Problem: Parts of the text in some documents are not recolored when a theme other than "Original" is selected in the "Aa" panel, resulting in severely reduced readability.

Steps to reproduce:
1. Open the document available at https://publikationen.bibliothek.kit.edu/1000181727
in Zotero 10.0-beta.6+3e7030a64 (64-bit).
2. In the "Aa" menu, switch the theme to "Black".
3. Navigate to the second page of the document.
4. Observe that parts of the text appear black, as shown in the attached screenshot.

What causes this issue, and how can it be resolved? This issue occurs with many other documents I have, regardless of which theme I select (except "Original"). The only difference is that with the "Black" theme the affected text remains somewhat readable, whereas with the other themes it can become nearly invisible because their backgrounds are not completely black.

https://s3.amazonaws.com/zotero.org/images/forums/u18869558/9ypbfonpv54ohtwbvvgx.png