Safari fails when loading Amazon product pages and a few other websites, a page will open, then go blank

Over the last two weeks, pages that used to work fine will load, and within seconds, the page will go blank, sometimes displaying an error to reload the page (which never works), but mostly just blank. Although this happens most with Amazon, it's been happening with a few other sites as well. This also happens on my iPhone and iPad lately.

If I open any of these pages in Chrome, Edge, DuckDuck, or Firefox, they work perfectly without any issues.

I have rebooted, deleted preference files, and reinstalled Safari to no avail.

I'm on a Studio Mac, 64GB RAM, running Sequoia 15.5