Hi Eagle,
It seems ok, you can use “suppression” tool in search consol, it will only remove the “collections/vendors/” pages. I tested, and for the moment, it is ok from my side.
Use the prefix option www.yoursite.com/collections/vendors?q=
To shopify team :
Do you think it is normal to take months to add a line of “404 not found” code that would solve this problem? I don’t think it’s normal on my side, it’s time to react.
It would also be interesting to advise your customers when we contact you by chat. I have contacted you 3 times about this, each time you told me that the problem was only from my side, and that no other shopify store had experienced this problem. It’s quite bold, when you see the number of topics dedicated to this problem…