I've created a test list on MailChimp and added two subscribers manually, all with default settings/fields: email, first name, last name.
I've created a test target list on SuiteCRM.
Using the SugarChimp setup wizard, following it step by step, I linked both lists.
I requested sync from MailChimp into SuiteCRM: subscribers as contacts.
We are using SuiteCRM 7.7.9.
I was able to debug, and I can confirm that the data is received correctly from MailChimp.
But then, the names are lost at some point, and I don't see any email records for those contact records either.