Crashing when moving Landscape to New Sub-Level

Howdy people.

In my game I’ve now enabled World Composition and I read you’re not suppose to have the landscape in the Persistent level so when I try to click on the landscape → click the new sub-level → add selection into level I get a crash, everytime. I’ve even tried doing just a copy/paste of the landscape. I get the prompt of This is a large selection you have selected (1024) components…etc and I click yes there is a small wait but no issue. But when I try to paste it into the new level; same issue. crashes.

The map I have is rather large, but not so huge that I see that being an issue. 1024 components is a lot but would that really cause the engine to crash every time?

On a side note, when the landscape is in the Persistent level and click the button Summons World Composition view, the landscape isn’t there? Thought, that was strange. Anyhoo; any help would be appreciated thanks!

Here is the log I have just before the crash:

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Thanks