text after display math block is not shown in web editor

[meonkeys]

Describe the bug
If Markdown includes a LaTeX-style block, text after this block is not shown in the web text editor.

To Reproduce
Steps to reproduce the behavior:

1. create the following Markdown file as, e.g. test.md:

ABOVE

$$
\sum_{i=1}^n i = \frac{n(n+1)}{2}
$$

BELOW

2. open text file in nextcloud web ui
3. notice text BELOW is not visible

Expected behavior
All text and math are rendered in order.

Screenshots

Server details:

• Nextcloud version: 33.0.3
• PHP Version: 8.4.21
• Database: MariaDB 10.11.17
• Text app version: 7.0.1

Client details:

• OS: 64-bit Ubuntu 24.04 desktop and AOSP fork /e/ OS
• Browser: Firefox 150.0.2 and Chromium 148.0.7778.167 and Nextcloud app running on /e/ OS (looks like a web view)
• Device: multiple: desktop, laptop, mobile

[wanderfunke]

It’s even worse than that: instead of simply not displaying the text, it deletes the rest of the text from the file.
This happened to me after this block:

$$
\text{Precision} = \frac{TP}{TP + FP}, \quad \text{Recall} = \frac{TP}{TP + FN}, \quad F1 = \frac{2\,TP}{2\,TP + FP + FN}
$$

[mejo-]

Thanks for reporting this issue @meonkeys and @wanderfunke. #8718 will fix it.