Turtle egg block model has stretched texture

The bug

The block model for minecraft:turtle_egg is textured in a way not consistent with other blocks, with the pixels not aligning to the 16x16 grid despite not having any rotation.
The main egg (largest and placed first) is a 5x7x5 "pixel" box but is textured as if it was 4x7x4. This causes the top to be stretched in both directions and the sides to be stretched sideways. The dot markings on the side of the egg are not square!
The 4th egg (shortest) is a 3x3x3 box but is textured as if it was 4x4x4. This causes all sides to be squished in both directions. The other two eggs look ok.