If I visit, https://www.amazon.co.uk/gp/registry/wishlist/search.html or https://www.amazon.com/gp/registry/wishlist/search.html I no longer see a search box; instead there is just a fancy mailto: link to send a message to invite someone to send you their wishlist details.
The documentation still says you can search for a wish list: https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201936720
I wonder if it is just a bug or whether they are trying to achieve something GDPR related?
Does anyone else still get the search?
(Also, whilst searching the documentation, I came across https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201503180, which has the breadcrumb trail: Test Topics › Test_it › Megan TEST › Dummy Gifts, Gift Certificates & Lists › Wish Lists› which doesn't look like it should be coming up in the search to me. I tried to report it to Amazon but their web chat bot/person just wanted a phone number and I was busy.)