Landscape disappear under mobile preview after reopen level

When trying to reopen a level with landscape under mobile preview, landscape's render data is not generated correctly.

1. Create a new level in Editor.

2. Create landscape in level and save the level.

3. Change "Preview Rendering Level" to "High-End Mobile"-> "Default High-End Mobile"

4. Reopen the level in content browser.

Result: The landscape created is not visible in level.

Fix UE-51650

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