Some reset to default buttons not appearing for UMG Appearance

Some reset to default buttons not appearing for UMG Appearance. This seems to only affect the Categories like Brush, Style or categories under Style like Normal/Hovered.

Individual properties reset buttons are functioning correctly.

Regression: Yes this works in 4.12

Workaround: Select widget again in designer or compile.

1. Open QAGame
2. Open UMG_Style
3. Select the button
4. Set the image under Style > Normal to any image

Result: Rest to default buttons do not appear next to Style and Normal.