Just installed a brand new 3.2.3 with that new tag feature and the default theme and no plugins. What a good idea to implement tags, but they don’t play too well with Search, and this is why:
Searching for tags in the search box only finds the posts which have that tag first in their tag list (I used commas to separate tags, right? And in any case if I click on the tags I get the expected result (all pages tagged with that tag, whereever the tags are in their respective tag lists)).
so, this isn’t my code that isn’t working, it’s shipped code. Just to be clear!