(even though they are influenced by Czech nationalist propaganda).
What do you mean?
In Czechia, the war in KCD - and the Hussite wars that followed - are not seen as that which they truly were: political and religious conflicts. Instead, they are presented as ethnic conflicts where the heroic Czechs fought against German occupiers.
You can see elements of this right at the beginning of KCD. A German peasant is spouting about his support for Sigismund to some Czechs. The conversation is framed within an ethnic context. "You Czechs." "Your king." "Germans like you." Then, when you go to throw shit at the German's house, your friends shout "For king and the country." and when a group of Germans catches you, the conversation again pivots around nationalist sentiments and insults.
This is not how people thought in the medieval ages. Wenceslaus was not "Czech" by any stretch of the imagination. Nobles married other nobles irrespective of their "national" background. Nationalism did not really exist until the French Revolution. Wenceslaus was more German than anything, but even this statement is anachronism. They simply didn't think like that.
There were towns and noble families in Bohemia that staunchly opposed Wenceslaus. There were regions in Bohemia that were Catholic and fought against the Hussite heretics. Presenting these wars as ethnic is the result of 19th century Czech nationalism and outright anti-Germanism.
Oh god, not this progressivist nonsense again. First of all, you are mixing two completely different things - nationalism (i.e. political ambition to have a nation state), and national awareness. While nationalism did became a thing much later, people were not retarded and they knew that they speak the same language, share the same history, customs, live in particular region and.....are czechs! And suprisingly, people could tell there are other groups, who speak different language, have different customs, came from a different region...and are germans! And even more surprisingly, 15th century was not a multicultural paradise where people celebrated diversity. Ingroup/outgroup dynamics and xenophobia didn't suddenly came into existence in 19th century, they are here since the dawn of humanity, beacuse that's what keeps people alive! The idea of a 15th century czechs being more inclusive than modern western liberals, not getting into conflicts with germans who back than had many privileges granted by the king (tax exemptions, exclusive rights for various crafts,...) is utterely ridiculous. It implies totally delusional idea of medieval people as some kind of aliens who's brains work completely different than ours.
That is all besides the point that we actually have a written proof of NATIONAL conflicts between czechs and germans in 14th century - Chronicle of Dalimil. That shit is full of explicit anti-german hatred.