Still, it is a bug, so thanks for reporting it!
The problem is about duplicate objects on top with black strokes with 0 weight. Why do you have these in the first place?
GPU can’t handle these well, and it’s a known bug, similar to this one: https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/43532958-jagged-artefacts-on-edges-of-objects-with-gradient
Try either of these:
— Remove duplicate objects
— Remove black stroke from these objects
— Increase the weight
— You can also switch to CPU mode, but it will just hide the problem
Cristina Gyorgy commented
no funciona bien