Steps to Reproduce:
Make a linearGradient element that works for translated user coordinate systems with the default gradientUnits="objectBoundingBox".

Then try the linear gradient in a rotated user space.

See https://commons.wikimedia.org/wiki/File:SVG_Gradient.svg.

Actual Results:
The bottom three rotated rectangles of the image all show gradient fills, but the three rectangles are not identical.

Expected Results:
The bottom three rectangles should be identical.

The leftmost bottom rectangle is correct but was done with gradientUnits="userSpaceOnUse".

The two rectangles to its right use objectBoundingBox and do not match. They do not have a white edge on the southeast.