SUMMARY
Frequently, when using the mirror tool, the mirrored pixels will be one pixe


STEPS TO REPRODUCE
1. Create a small image (ex: 32x32) to easily observe the issue.
2. Enable the Horizontal Mirror Tool, centered in the image.
3. Select Basic-1 brush and set the scale to something small, like 2px.
4. Draw near the center or edge of the image.

OBSERVED RESULT
Drawn pixels are off by one pixel on the mirrored side.  For example, on the right side, there may be 2 pixels to the center of the image, but on the left side there is only 1.
https://imgur.com/a/NhgEYnG

This does not seem to reproduce on all brushes.  Pixel art brushes seem to mirror correctly.  Sometimes brushes that are normally off by 1 pixel will also mirror correctly.  Behavior is inconsistent.


EXPECTED RESULT
Pixels are mirrored exactly, so a pixel drawn next to the edge will be next to the edge on the mirror.

SOFTWARE/OS VERSIONS
Windows: 10

ADDITIONAL INFORMATION
If this doesn't reproduce, try creating a new document or restarting Krita.  One time all brushes were mirroring properly, but on a later attempt they were off again.