Forums Bug Reports Õ,Ö,Ü and Ä

Hei,
I do not know if this is a bug.

I use server irc.estirc.net and it allows öüõä alphabet.
If someone's name is Õun, and I press õ + tab, then nothing will happen. If i write Õ + tab it works.

Is it possible to do that: õ=Õ, ö=Ö, ä=Ä and ü=Ü.
Highlight same problem. I set my name "Õun". If someone says Õun it works. If someone says õun its not highlighting.
Highlight setting: $me

I think that this is a problem in mIRC?