Forza Horizon 4 won't launch

It ran great until I bought the Ultimate Add-Ons bundle, now it simply crashes after showing the splash screen for 30 seconds.

From the event viewer:

The program ForzaHorizon4.exe version 0.0.0.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.

 Process ID: 121c

 Start Time: 01d583bbce819799

 Termination Time: 4294967295

 Application Path: C:\Program Files\WindowsApps\Microsoft.SunriseBaseGame_1.351.461.2_x64__8wekyb3d8bbwe\ForzaHorizon4.exe

 Report Id: b51b6c95-35dd-4832-9833-a776463cae39

 Faulting package full name: Microsoft.SunriseBaseGame_1.351.461.2_x64__8wekyb3d8bbwe

 Faulting package-relative application ID: SunriseReleaseFinal

 Hang type: Activation

Edit 12/13/2019: After installing the latest update last night, the game seemed to start fine. I will continue to update this post with status.

Edit 12/14/2019: The game no longer starts.

Edit 12/28/2019: See user realcoda's post on page 5 for a solution. Be sure to back up everything on your PC before attempting as it involves editing your registry.

Edit 2/19/2020: The game runs after today's patch.

Edit 2/21/2020: Today's patch has reintroduced the original issue.