Steps to reproduce:

1. Open project "LoadLevelAsync.zip"
2. Open scene B and in its Lighting window notice that it has Precomputed Realtime GI enabled
3. Open scene A and run it. It continuously loads between scene A and scene B
4. Observe Unity hard-crashes

5. Reopen project
6. Open scene B
7. In Lighting tab, clear baked data or disable Precomputed Realtime GI and rebake lightmap
8. Save scene and open scene A
9. Notice that Unity no longer crashes

Regression introduced in 5.2.2p4
Not reproducible in 5.3 or 5.4