Go to browse in your anki, then you will find the reset local changes button here
Yes, it has always been like this. See more here: Why are the Physeo media packs only available to those with a subscription? and Why don't I have all the media in the AnKing Step Deck?
If you have them protected, AnkiHub can’t move them or alter them. So if you are missing images in V11 and you have protected them, upgrading to V12 will not make them show up unfortunately