Opening map assets from the "Open World Demo Collection" sample results in the engine freezing.
No crash occurs, just a lock up of the engine at 75%. There is the possibility that it could take some time, but when testing, I let the project sit for 2 hours and it was still unresponsive.
1. Add 'Open World Demo Collection' to a project and open
2. Launch either of the maps provided by "Open World Demo Collection"
Result: Engine freezes
Expected: Map to open
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-90326 in the post.