Clearing concrete 5 cache makes certain Areas disappear

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Hello All,
I'm having some weird behavior on a site I've been working on and am close to finishing. We have full page caching set up on most pages with the exception of a few that are completely dynamically built from an external api.

We've had to clear the cache a couple times because of content changes not taking. However clearing the cache made some areas on one of the full page cache pages not appear. And Editing the page and resaving all the same information seems to always fix this problem.

Is there a possible reason anyone can think of why the areas wouldn't rerender with the information already saved in them after I clear the cache? The blocks permissions inherit from the area permissions which in turn inherit from the page permissions (public on the prod site, locked to admins and registered users on dev and staging).

Any info would be awesome.