So it appears, though I’m unsure whether it auto-accepts required cookies, those that have no opt-out option. If it’s banners, and not walls, then UBlock blocks the banner and thereby doesn’t give permission to store any kind of cookies, including the required ones. Kinda as if you browse the site without ever interacting with the banner.

Sadly, both need to trust that the site actually follows the rules and respects the selected/unselected cookies.

EDIT: Scrap all that, most sites don’t respect cookies settings either way, might just get either of the above and Cookie Auto Delete or something similar.