with this went well. the file of the first image instead behaves well if opened with st10 and badly if opened with v2021. I will try to understand if there is any changeable setting.to me does not happen (if 2022).
depends on whether or step settings?
try the step I attach (the same as the image) and let us know.
ah thank you, so far I had converted into synchronous and then deleted faces. I try!depends on the step file.
in any way to join the cyclics it is sufficient to use the command "optimize". probably on the st10 is done automatically, depends on the import settings.