I have the same problem. Imported multisite are forcibly added as single-site. I did an experiment. I created a test multisite in Local 5.2.5 exported it and imported back under a different name. The new site has become a single site.
I have the same problem. Imported multisite are forcibly added as single-site. I did an experiment. I created a test multisite in Local 5.2.5 exported it and imported back under a different name. The new site has become a single site.