That’s my experience. I have other brands and the ANC on Q30 is meh. Doesn’t mean don’t buy them, many other advantages, but the ANC just has to be downplayed so it’s not a source of negative comments.
ANC = added noise created, it’s an added hiss sound.
On replacement already, gave up thinking bug / unit , it’s a “feature” of the product. I’m sure it’s a learning experience and the successor will be the better for the feedback.