So, now back to the topic:
I called the bank today, the offer from June 1st at 1.99% for 20 years has been corrected to 2.49%
Today it is already 2.65%, the same offer at the same bank has increased by 0.66% within 24 days.
Even though that is over 50,000€ difference over 20 years, we are pleased with the low interest rates