If user changes the Sprites name template, they will have to click the Extract button twice

In the Extract Sprites window, if the user changes the Naming Template, they will have to click on the Extract button twice for the sprites to extract.

1. Launch UE4Editor.exe ContentExamples.
2. Find T_JazzIdle_D in the Content Browser.
3. Right-click it and select Sprite Actions>Extract Sprites.
4. In the Extract Sprites window, change the Naming Template.
5. Click Extract.

RESULT:

Sprites will not be extracted on the first click (though a progress bar will appear briefly). User will have to click it a second time.