The new DepthOfField post process effect makes BillboardGui-parented GuiObjects with 0 transparency, act as if they’re semi-transparent.
This only happens when the BillboardGui is rendering where the in-focus and out-of-focus points meet.
Example:
Here’s a repro file:
Position your camera somewhere near a BillboardGui and slide the InFocusRadius up/down and you will notice the behaviour.
DepthOfField BBGUI Repro.rbxl (26.4 KB)
Expected behaviour would be the GuiObjects become blurred, not semi-transparent as well. I do not know if this happens with SurfaceGuis or only Billboard.