"so" assigned wrong shape

When applying 4-shape or 7-shape note heads to music the "so" gets an upward pointing triangle instead of the normal circular head.

Line 79 and 81 were incorrect.
degrees = [9, 12, 10, 9, 12, 10, 4];
degrees = [7, 8, 4, 9, 12, 10, 11];

Replacing the 12 in the arrays with a 0 produces the correct result.
degrees = [9, 0, 10, 9, 0, 10, 4];
degrees = [7, 8, 4, 9, 0, 10, 11];