Unable to create a default DataFile object on a ManagedInstance database

Run the following code snippet (tweak the connection string ("...") to point to a ManagedInstance server):

var dbname = "bugDB";
var srvconn = new ServerConnection(new SqlConnection("..."));
var srv3 = new SMO.Server(srvconn);
var db = new SMO.Database(srv3, dbname);
db.Create();
                
DataFile df = new DataFile(db.FileGroups[0], "MatteoDF"); 
df.Create();

It won't work.

If you set some properties on the DataFile object before the creation, it'll work.

Start by running the C# reproduction with a connection string targeting a Managed Instance, focusing on DataFile creation after db.Create(). Compare the failing default DataFile path with the case where properties are set before df.Create(), and use that behavior to identify the missing creation requirements. Done means the snippet creates the DataFile without manually setting those properties.