Boats appear partially submerged

For some reason my texture pack displays boats to be partially submerged when placed. Through testing i found out it happens when gl_FragColour = (0,0). This removes the white circle that appears when split controls is turned off on mobile. This is also the case for another texture pack i found online that does the same (not mine). Is this a bug or is there another alternative to remove the circle and keep the boat model displayed properly?