I do not program, simply a user. I saw a similar problem issue that was closed in 2017, but this is 202 and similar problem. I just started using and used MeshMixer to edit an STL file and save in ...
which platform are you using (say it also on the subject of the issue) which version of meshlab are you using (e.g. 2020.09 portable. 2020.06 snap, 2020.12 installer) be sure that the issue is ...