What is the difference between WiFi Direct Concurrent Group and WiFi Direct Cross Connect

Question

I am looking for some insight into the way WiFi Direct (P2P) Group works especially around "concurrent" and "cross connect" feature of the P2P Groups. I'm going through the specifications of WiFi Direct from the following link https://www.wi-fi.org/discover-wi-fi/specifications

In the above link you can look for the "Wi-Fi Direct Specifications".

The document has the following definition for the P2P Concurrent device: Click here to open image for P2P Concurrent device

On Page 66 of this document, it mentions "cross connect": Higher-layer data services may use IP. The P2P Group Owner shall act as a DHCP server to provide IP addresses to the connected P2P Clients that use IP. The DHCP Server shall at a minimum support Internet Protocol version 4 (IPv4) and assignment of an IP address, subnet mask and should not include the default gateway unless the P2P Device is providing Cross Connect. If P2Ps [10] is supported, the default gateway shall not be included unless the P2P GO is providing Cross Connect.

Question: My question is what exactly is "Cross Connect"? It's my understanding that Cross Connect means the P2P Device (either P2P Group Owner OR P2P Group Client) will be able to connect to a WLAN (Infrastructure Network) AP (Access Point) alongside being part of the P2P Group. But isn't that done using the "Concurrent Group"? What exactly is the difference between "Concurrent" and "Cross Connect"? Thanks for helping out and providing your expert opinions.