Do Il mondo della luna and Dalibor both have connections to German opera?
Il mondo della luna:  It is sometimes performed as a singspiel under its German title "Die Welt auf dem Monde ". Dalibor (opera):  The libretto was written in German by , and translated into Czech by Ervin Špindler. Dalibor (opera):  The opera received criticism at the time for being overly influenced by German opera, including that of Richard Wagner.
yes