Although Germans are famously methodical, my experience with German bureaucracy was that it's quite flexible. They will break you, and when you finally give up and seem like you're about to cry, they will roll their eyes, and oblige you, stressing how exceptional and magnanimous they are for letting you get what you want. In reality, they were rooting for you the whole time, but did not want their flexibility to be taken for granted.

I document German bureaucracy for a living. I cannot stress enough how "vibes-based" the entire thing is. Half the job is convincing bureaucrats that you're either overprepared or litigious to be worth the trouble.

The best strategy I've found with such bureaucrats is to bike shed them with an obvious but easy problem that you fix with much adieu so they can feel like they've found you out and feel like they've done something. Meanwhile they will ignore all the subtler things that might be much harder for you to deal with.