After editing a SVG, I go to export it, and choose PNG 120x120, scale 1.0, uncheck all the boxes. I get a PNG file that’s 121x121. If I do 180x180 it’s correct. This started happening with this particular document after I increased the width and height, although I’ve done this many times in the past without seeing the bug.
My workaround was to adjust the overall size of the PNG to 100x100.
Use case: I mainly use Vectornator for creating iOS app icons, so I want export of raster images at various sizes to be quick and reliable.