In German, history of the letter and rules even dictate that ö should be written as oe in such cases (that's what it evolved from and that's what the two dots a

In German, history of the letter and rules even dictate that ö should be written as oe in such cases (that's what it evolved from and that's what the two dots are; e.g. it's not a diaeresis in German, despite looking the same).