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> But even a lot of Germans don't know this, I'm afraid.

Yes, because this is not the case.

https://www.bussgeldkatalog.de/geschwindigkeitsbegrenzung-au...

While this is true it's also not uncommon for signage to be faulty, i.e. not following official regulations, or invalid unfortunately. Most often at construction sites.

My driving instructor also told me this. I learned the hard way with a pretty hefty ticket.