[4.8 Preview 2] Widget blueprint compiler error, Property associated with x could not be found

Hello,

One of my widget blueprints causes a compiler error in my player controller blueprint where it is used to create part of my UI. It doesn’t seem to be able to find a variable named “MenuBox” in the widget blueprint even though it is compiled. Starting the program renders all functionality in my player controller script to be unusable. Recompiling and saving the widget blueprint fixes the problem in the editor. The problem persists through packaging and makes my program unusable even though it is perfectly functional in the editor. My blueprints work fine in version 4.7.6. I’m attaching some screenshots of the error:

Error in player controller blueprint:

Widget hierachy. The MenuBox variable is checked to be exposed as a variable:

Inspecting the MenuBox variable in the widget blueprint graph editor: