Flowing water block uses still water texture

What happened: Flowing water blocks uses the still water block texture. And the black triangulation texture is MCPE-18778

What I expected to happen Flowing water would use the flowing water texture. And that the black triangle texture would not be there

Device: Nvidia Shield K1 Tablet

Edit: better formatting

Edit 2: An image of MCPE-18291 (the top square)

Edit 3: Here is a video for a better represention of this bug

Edit 4: Would like to mention that it isn't consistent on when this bug appears. Sometimes I can see the texture glitch, sometimes not