RTL characters rendered instead of letters with diacritics

A few hours ago I created a new instalation (1.8.9), and renamed it to "Última versão que presta". Right after that, noticed the letters "U" and "a" - both can be used with diacritics in Portuguese - were replaced by some kind of RTL character, as you see below.

"Última versão que presta" suddenly became "ڬtima vers㯠que presta".