Safari Connector saves metadata but Full Text PDF fails to download (red ×) on all websites (Debug

Content:

Hello,

I'm experiencing an issue with Zotero Connector on macOS.
Environment

macOS (Apple Silicon)
Zotero 9.0.6
Safari 26.5
Zotero Connector for Safari
Debug ID: D2076714507
Problem
When I save an article using the Zotero Connector in Safari, the bibliographic metadata (title, authors, journal, etc.) is saved successfully, but the Full Text PDF always fails to download.

During the save process, the popup shows:
✓ Journal Article
✗ Full Text PDF

The red × appears next to Full Text PDF, and no PDF is attached to the saved item.

This happens not only on CNKI, but also on several international publishers and databases.

What I have already checked
Zotero and the Safari Connector communicate correctly (`http://127.0.0.1:23119/connector/ping` returns "Zotero is running").
I can download the PDF directly in Safari without any problem.
The downloaded PDF can be manually dragged into Zotero.
"Automatically attach associated PDFs and other files when saving items"is enabled.
Safari has granted the Zotero Connector permission to access all websites.
I have reinstalled both Zotero and the Safari Connector, but the issue persists.

Could anyone help me determine why the Connector fails to download the Full Text PDF?

Thank you very much.
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