That is complaining at a very high level. There are banks that inform you after 4 months that the application will no longer be processed and that you can get an offer based on current conditions. Everyone can imagine what that means in this interest rate environment.
Sparda BW is one of the most builder-friendly banks I know. Try explaining to an insurance company as a financing bank that there is a problem with the land registry or that the shell construction costs more. Unfortunately, they often lack experience with financing construction projects. Sparda and other banks have not been doing this only recently. And believe me, the problems will come, sooner or later.