Play button disappear when turn on Slate.EnableLayoutCaching option.

I turned on Slate.EnableLayoutCaching option to reduce widget component draw cost.
The draw cost is reduced but, play and launch button is disappeared.

  1. Click Play button.

  1. Type “Slate.EnableLayoutCaching 1” on command line to enable option. Buttons are still shown correctly.

  1. Click Stop button.

  2. Play and launch button is disappeared.

How to solve this problem?
I want to turn on Slate.EnableLayoutCaching.

Hello,

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Thanks