access denied feed /[id]/ import for a thread article

I am dealing with an old d8 site that has a custom type thread element with a custom processor. When I go to admin / content / feed and I click on an existing file, I go to feed / id / import, access is denied. If I add a new one, I do not get the same error, but I'm trying to figure out what support was set for the "import" operation of a feed?
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