Auto-Exposure Overriding Preview Scene Profile Settings

The static mesh preview scene profile settings for post processing is being overridden after closing and re-opening any static mesh.

1. Create new project with Starter Content.
2. Open Shape_Cube Static Mesh
3. Open Window > Preview Scene Settings
4. Click the Add Profile and set that to the current profile.
5. Uncheck Show Floor, Show Environment, and Post Processing Enabled
6. Close the Preview Scene Settings window and the Static Mesh Editor.
7. Re-open Shape_Cube

Alternative Repro

[Link Removed]

Outcome The preview window begins to adjust brightness as if auto-exposure was enabled. Even though post processing has been disabled for that profile.

Expected The preview window looks identical to the when it closed.

Fix UE-51650

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