Xbox One : Windows 10 cross play now only works one direction

back on 1.12:

Xbox One S could connect to Windows 10 via LAN

Windows 10 could connect to Xbox One S via LAN

near 2019-11-12

both were updated to 1.13

Now:

Windows 10 can connect to Xbox One S via LAN

But Xbox One S Cannot connect to Windows 10 via LAN

The friends tab shows (1) friend, but no games even show up on the list to connect to.