Multi-page Markdown Quick Look preview turns blank on macOS 26.5 beta (25F5053d)

[kcui23]

Bug

After updating macOS to 26.5 beta (build 25F5053d), QLMarkdown has started showing a serious rendering bug in Quick Look.

For multi-page .md files, only the upper part of the document is rendered. The remaining content area turns completely white instead of continuing to render the rest of the file.

Environment

• QLMarkdown
• macOS 26.5 beta (25F5053d)
• Finder Quick Look preview for Markdown files

Reproduction

1. Use QLMarkdown as the Quick Look extension for Markdown files.
2. Open a long / multi-page .md file in Finder.
3. Press Space (or otherwise open Quick Look).
4. Scroll down in the preview.

Expected

The entire Markdown document should render normally in Quick Look, including all later pages/sections.

Actual

Only part of the document is rendered.
After a certain point, the rest of the preview becomes a blank white area.

Notes

• This started only after updating to macOS 26.5 beta (25F5053d).
• The problem is reproducible with multi-page Markdown files.

[sbarex]

I'm not currently testing the 26.5 beta. Can you attach a md file that's causing problems?

[kcui23]

sure, try this one:
Pasted markdown.md

[sbarex]

this issue is fixed on last release/with the last macOS 26.5.1?