Crash on mobile OpenGL with a retainer box

1. Copy [Link Removed]to a simple project.
2. Set the "Map_Retainer" as the game default map in ProjectSettings.
3. Package Android OpenGL
4. Install it on an Android device.

It will crash on the first frame. The crash log [Link Removed]

It wouldn't crash if set Slate.DeferRetainedRenderingRenderThread 0 in DefaultEngine.ini

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