Proton: Some text inside message in not visible but present

### Is there an existing issue outlining your problem?

- [X] I am using the latest version of the provided userstyle.
- [X] I have searched the existing issues and they do not solve my problem.

### What userstyles are you seeing the problem on?

lbl:proton

### Describe your problem.

Some text inside messages is rendered in white colour, and the background is also white, so I cannot see the text.

### Attach screenshots.


### What browser(s) are you seeing the problem on?

LibreWolf 124.0.1-1

### Any additional comments?

When selecting the text as in the screenshot, it is revelaed.

Start by reproducing the issue in the lbl:proton userstyle using LibreWolf 124.0.1-1, then inspect the message area shown in the attached screenshot. Done means all message text remains readable without selecting it, while preserving the existing styling.

Written by the indexing model from the issue text.