[TYPO3-english] realurl and multidomain can display wrong language path

[Domi]

Hello,

I set up a website with the _DOMAIN functionality of realurl. Everything 
works how it is supposed to be. But one thing is bugging me:

I can paste the readable URL path from one language into the other and 
it works as if the correct language path would have been taken:

DOMAIN.DE/path_in_english.html
   -> show german content of this path

DOMAIN.COM/path_in_german.html
   -> shows english content of this path

Did I miss a flag in the realurl setup for preventing this behaviour? My 
sitemap.xml doesn't create this paths, so not sure if this would be ever 
displayed, but I see it as a risk of duplicated content.

I use 6.1.1 and newest realurl. Would be great if somebody can tell me 
if there is any option I missed out.

Regards,
Dominic