Shape bitmap texture works as intended within the editor and even works in runtime when the source is either the gv pointing to a wallpaper or the album art from a music player, but fails to work in runtime when it is a YouTube thumbnail that has been stretched to fill the entire screen. If I don't resize the shape to be so big that a 16:9 image fills the 9:16 screen, it works as intended but then I have letterboxing going on. When I make it big enough to eliminate the letterboxing it only works in the editor for reasons unknown.
Attached are screenshots to show the problem and a debug log as produced by the editor.
Also note I am running the update released today, Jan 3 2019.