Hi Micha. It seems to me that the direction reduction does not work correctly in the program when working in the Gauss-Kruger projection. Namely, if active "horizontal distance reduction" then "direction reduction" stops working.
I am attaching a project with a triangulation network.

https://wdfiles.ru/a0668d
https://wdfiles.ru/04c32c
https://wdfiles.ru/a435ed