It seems as though the only issue here was that indirect rendering wasn't being used. Marking NOTABUG. There is another bug concerning actual breakage of texture_from_pixmap (which was the problem I was referring to) at #14441.
It seems as though the only issue here was that indirect rendering wasn't being used. Marking NOTABUG. There is another bug concerning actual breakage of texture_from_pixmap (which was the problem I was referring to) at #14441.