New here, with the same sync problems on my ST. Read in a previous post that Ford had dropped a new version -23188. Went out to the Explorer, connected it to my Wi-Fi and checked for updates. Said I was up to date with ver 22251. Checked for app updates and suddenly it was downloading
an update NU5T-14G381-AD_1689364279000.TAR.GZ.
Took about 40 minutes, the screen refreshed, and everything looked like it used to. Full nav map showing, not half. Put the radio onto a Sirius channel, shut it off, locked it and went in the house. Came back an hour later, everything still works and the radio stayed on the same Sirius channel.
Looks like Ford's update works.