macOS reading list not saving offline

Hi,

It appears as though Reading List articles are not being saved offline on my Mac. I have a 14" M1 MacBook Pro base model, running macOS Monterey 12.2. I have "Save articles for offline reading automatically" set in the Safari preferences under the Advanced tab, and I have iCloud for Safari enabled in System Preferences.

The only web pages that correctly save offline when added to the Reading List are Apple web pages. I tested both Wikipedia articles and some articles on the New York Times, and it looks like they do not save offline, even though I waited for the "Saving for offline viewing..." text to finish in the Reading List side bar.

To troubleshoot, I cleared my reading list, disabled automatic offline saving, closed Safari, re-opened it, and re-enabled offline saving. This still did not help. I also made sure iCloud was synced by opening Safari on my iPhone 13 and seeing that the reading list was cleared there, too.

Is there a solution for this? This was really disappointing on my flight yesterday. I can save web pages as PDFs for offline viewing, but I'd much prefer to use Reading List, especially with synchronization across devices.

Thank you.