[Safe/Unsafe Fraction] Investigate failing test where safe/unsafe fraction doesn't match

[Ughuuu]

Failing test
DirectSpaceState2D | testing [cast_motion] from [get_world_2d().direct_space_state] > Can collide with Body

Test Description:

I have 2 shapes, shape_A and shape_B.
shape_A has motion 360.
shape_A is located at b2Vec2(5.76, 3.24)
shape_B motion 0.
shape_B is located at b2Vec2(11.52, 3.24)
tMax is 1.

After calling timeOfImpact, I find t = 0.014
Distance that shapeA traveled is is 5.05

After calling b2Distance at moment of impact, I get distance between two shapes = 11.57

[safe, unsafe]
[0.0126953125, 0.01416015625] - godot2d
[0.01255518198013, 0.01404166780412] - box2d