Mysterious lack of caching due to origin 8443

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hello, i spent half of today trying to figure out why my webiste cache is dynamic, and only after clicking through every forum post did i learn that origin port 8445 among others is not cached.
this isnt mentioned anywhere in page or cache rules / configuration, and isnt even present in the caching documentation.
i think it would be good to notify the user that caching wont work if the origin port is set to one of the blocked ones, and also put it in caching docs.

It’s in the docs for ports:

Do you use 8443 only as an Edge port or as an Origin port with origin Rules?

I would have never thought to search through the documentation for ports to resolve issues with caching, i only found the page linked on this forum.
I used port 8443 as an origin port