I drew a simple raster box to test head bounce on my laser. I’m using bi-directional scanning and see the horizontal lines fine, but no laser firing on the vertical only lines. I have the speed set to 300mm/s. line interval is 0.050, DPI works out to be 508.
When I set the image mode to dither, it works as expected.
The work area is in the middle of the table with plenty of acceleration/deceleration room on all sides.