This is fixed in the preview build and will make it into the main build eventually.
Bug report - RW Paint
closest neighbor 300%
resize goes wrong by 1 pixel.
How to reproduce the bug:
Make a 16x16 image.
draw 1 pixel in the middle.
Resize image to 48*48 or by 300%
(Method is 1st choice: closest neighbor)
The 1 pixel became a 2x2 square, instead of a 3x3 square.
Alternate reproduction:
draw 1 pixel in each corner of the image,
resize to 300%
top-left is now a 4x4 square, top-right is a 2x3 rectangle, bottom-right is 2x2 square.