Test failed if Enum property is not null

public class PersonWithText
        {
            public System.Int64 Id { get; set; }
            public System.Guid SessionId { get; set; }
            public Hands ColumnNVarChar { get; set; }
        }

If the ColumnNVarChar in table CompleteTable is set as not Allow Null, the test (and others) TestInsertAndQueryEnumAsText failed with
"No coercion operator is defined between types 'System.String' and 'RepoDb.SqlServer.IntegrationTests.EnumTests+Hands'"