Related to [Session Launching is taking extremely long] we are now dead in the water working on our project. After 20 min we consistently get this cook timeout error and can no longer play our project.
If I delete about 300 devices from the project and try to push changes then we can once again load after 20 min.
Our Project Size is only 17% but switches to ??? when it is getting the cook timeout
Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here: Fortnite Creative