UMG Regression - Combobox displays Menu Border Brush as Grey instead of transparent

Summary

The UMG Combobox component seems to be showing a gray background on the “MenuBorderBrush” option instead of being completely transparent.

What Type of Bug are you experiencing?

UI / Tools

Steps to Reproduce

  1. Create a new widget
  2. From the input section in the palette window, select ComboBox (String) and put it in your hierarchy
  3. In the Details panel, under Style and Combo Button Style, open the Menu Border Brush menu
  4. Select “None” in the Draw As drop-down.
  5. Another alternative way of reproducing it is setting the alpha on the tint to 0.

Expected Result

The background should be completely transparent and should not show anything.

Observed Result

The background has a gray overlay instead of being transparent. If you were to change the image of the Menu Border Brush, any transparent/masked parts now also show this gray overlay underneath.

Affects Versions

5.7
5.6

Platform(s)

Windows

Upload an image

Additional Notes

This post also covers my problem in more detail, but it has been locked.