I need to investigate an issue around full page cache (fpc) in M1, because we sometimes receive 404 errors on product pages when the cache is invalidated - and no 404 pages anymore after the cache has been refreshed.

I know that it is invalidated, because Admin > System > Cache Management shows "invalidated": Magento 1 full page cache (fpc) invalidated

When I refresh the cache via the controls at the top of the same page, everything is fine; no "INVALIDATED" anymore, and no 404 pages. But I want to automate this. For automation, I need to be able to test it. I can only test it, if I can reproduce it.

Therefore, my first question around this topic is:

How can I manually make the fpc "INVALIDATED"?

And, as an advanced question: How can I manually cause the fpc to be marked as "INVALIDATED", and a specific product page to return a 404, which will be no 404 any more once the fpc is refreshed?

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