black artifacts after compression

[feili2]

Hi Guys!
Unfortunately I have some black artifacts with some models (occurs more with curves) that I can't get away with even with various settings ... Somebody already had this problem and was able to solve it ...

here
https://discourse.threejs.org/t/normal-map-artifacts-draco-compression/5886
or here
#451

but unfortunately it doesn't help me at all ...

Do you have a solution for me here?
Thanks in advance!
Philip