Regression: Visibility property is not seen in the animation track in UMG

Visibility track in 4.15 launcher version is not visible. Converted projects from previous version which already had this track, but cannot create new one.

If I add Interp keyword in the UPROPERTY, I can fix this.
What I don't understand is that there is no Interp keyword in previous version.

**Added: This issue is not reproduced in main branch.

in Widget.h

/** The visibility of the widget */
UPROPERTY(EditAnywhere, Interp, Category="Behavior")
ESlateVisibility Visibility;

1) Open UMG editor. Add a button.
2) Create a widget animation
3) Add a Button track
4) In the +Track button, Note there is no Visibility property.
5) Try same step in 4.14

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