644, but my artist said his canvas was right 92, fixed animations (not moving cause the pivot pixels are the same every same), if I play that sprite on online animator sprite, and set it to 92 x 92, it work well
It is straight forward math.
640/7 = 91.4x
That is all Godot is doing with the image; slicing it by the horizontal frame count.
As for the vertical; again Godot will go by the image size in the file and divide by the vertical frame count.
Open the image in a graphics editor and change the vertical size to 92 and try adding the 4 pixels to the end of the image.