This seems to be because the OrbitZoom of ThumbnailInfo is rewritten by ResetCamera () when the viewport is opened.
Is this correct processing?

Steps to Reproduce

1. Create a new blueprint. (Inherits actors)
2. Add a cube component.
3. Edit thumbnail in the content browser. (Zoom up as much as possible.)
4. Open BP, check viewport and save.
5. The zoom of the thumbnail changes.

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ComponentUE - Editor - Framework - Content Browser
Affects Versions4.23
Target Fix4.25
Fix Commit9631076
Main Commit11224363
CreatedOct 14, 2019
ResolvedOct 17, 2019
UpdatedFeb 11, 2020