Steps to reproduce:
- Go to pl.wikipedia.org and focus the search box.
- Start typing "Bedusz".
- You will see results including "Będusz".
- Hit <return> to search for the plain Latin term.
- Your search results will not include local pages which include the non-Latin term.
On en.wikipedia.org for example, where ICU folding is enabled, the autocomplete and actual search return similar results which include the non-Latin matches.
It's likely that the search results will be fixed once we enable ICU folding using UTR#30 rules, but this autocomplete bit was mysterious enough to file as a separate bug.