Progress Percent is removed from UMG Progress Bar when Transform Shear value is changed

Modifying the Shear values on a Progress Bar in a Widget Blueprint cause it to lose its Fill Color and set Progress. This is a regression from 4.20.3 (CL-4369336). Reproes with -vulkan on both Linux and Windows.

This was reported and tested in 4.21 (CL-4541578). This was reproduced in 4.22 (CL-4550799).

1. Open the UE4 Editor and create a Blank project
2. Add a Widget Blueprint
3. In the Widget Blueprint drag a Progress Bar into the Widget Editor
4. Select the Progress Bar, under Progress set the Percent to .5, and under Render Transform change the value of Shear's X or Y to a value different that 0 or 1

Results: The Progress Bar becomes empty as the Shear values are changed

Expected: The Progress Bar stays at 50%