When searching for certain words with diacritics the user gets different then when using none.
I stumbled over this issue when looking for Dhalle respective Dhallë in WP:DE.¹
When a "normal" user sees somewhere a word with strange diacritics not easily to reproduce the search engine still should deliver helpful results.
Search for Dhalle:
Search for Dhallë:
Also, be sure to update the German WP documentation on character folding.