Augh. Bizarre. Oh, do you have the "pop-up" overlay with icons for share, filters, etc. visible? (The one which appears when you tap the image.)
On my Pixel 3 XL, the behaviors I described occur, and also the logo is invisible unless the overlay is shown (in which case it's drawn only near the edges, unless you're taking a scree...oh.
I get it.
Image math is getting done internally in a wide gamut. Including alpha blending. But it's converted to sRGB before being displayed.
The things I described all, I suspect, modify the image- mostly by just dimming it, and the resulting dimmed wide color values map to different sRGB colors (where the undimmed colors all map to the same shade of red.)
I have a hunch that the internal management of the image by the application you've described is similar to the case of another comment where the logo could be seen in Windows after saving the file in MS Paint.
On my Pixel 3 XL, the behaviors I described occur, and also the logo is invisible unless the overlay is shown (in which case it's drawn only near the edges, unless you're taking a scree...oh.
I get it.
Image math is getting done internally in a wide gamut. Including alpha blending. But it's converted to sRGB before being displayed.
The things I described all, I suspect, modify the image- mostly by just dimming it, and the resulting dimmed wide color values map to different sRGB colors (where the undimmed colors all map to the same shade of red.)