Can not create docdb cluster within non-default VPC

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This is 🐛 Bug Report

[siyuanh]

Okay the problem is solved, but I think it needs to be well documented The problem is when I create the subnet group I need to explicitly give a name like this

        docdb_subnet_group = docdb.CfnDBSubnetGroup(
            self, "DocDBSubnets",
            db_subnet_group_description="Subnet group for DocumentDB",
            db_subnet_group_name='fix_is_here',    # must have a name here instead of the default name\
            subnet_ids=list(map(lambda x: x.subnet_id,
                vpc.private_subnets)),
        )

[lbjay]

Same here. I don’t know what the underlying issue is, but dbSubnetGroupName is effectively a required prop for creation. Spent a couple hours trying to figure this out before finding this issue.