Looks like Chromium is about to change how prefetches behave, so that only cacheable resources will be served from the prefetch cache: https://groups.google.com/a/chromium.org/g/blink-dev/c/Zdo71C0k9C0/m/BRXW6aQiAAAJ?utm_medium=email&utm_source=footer

If you're prefetching your HTMLs, make sure they are actually cacheable, even with a short lifetime.

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