Bias distrusting area of expertise while implicitly trusting other domains?
I found what I was looking for.  It's called the Gell-Mann Amnesia effect:

... You open the newspaper to an article on some subject you know
well. ... you read with exasperation or amusement the multiple errors
in a story, and then turn the page to national or international
affairs, and read as if the rest of the newspaper was somehow more
accurate about Palestine than the baloney you just read. You turn the
page, and forget what you know.

That quote is attributed to Michael Crichton, who named the effect after his physicist friend Murray Gell-Mann, who discovered it.
This effect is not studied in psychology as far as I can tell, so it may not be real, but having a name for it helps learn at least that much.