Description

PCG Level Asset export doesn't support exporting a level while it is loaded as a sub-level. We should warn the user instead of crashing.

Steps to Reproduce
  1. Create a new empty level (Level_A)
  2. Create a new empty level (Level_B)
  3. Open Level_A
  4. Open "Levels" window (Window -> Levels)
  5. Add Level_B into Level_A (Levels drop down -> Add Existing -> Level_B)
  6. Reopen Level_A to make sure changes are saved
  7. Run the "Create PCG Assets from Level(s)" command on Level_B (right click on Level_B in the content browser -> Asset Actions -> Create PCG Assets from Level(s))

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Fixed
Fix Commit45104201
CreatedAug 21, 2025
ResolvedAug 22, 2025
UpdatedSep 5, 2025
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