Issue
Large worlds do not synchronise when desynced.

Details
I had performance issues with my Xbox and was advised to perform a reset of the console. This solved the performance issues I was experiencing on my console but this obviously desynchronised all my game data, including Minecraft. By loading or "editing" a world I was able to recover most small-sized worlds, but larger worlds still fail to synchronise. These worlds are inaccessible and can not be edited, copied or deleted.

Steps to Reproduce

1. Have a large-sized world (the ones I refer to are typically over 300MB)
2. Reset the Xbox One console
3. Load Minecraft (at this point, all worlds will be greyed out)
4. Attempt to synchronise the large world

Expected Results
The world should properly synchronise and be accessible again.

Actual Results
The world attempts to synchronise, fails and becomes inaccessible.