when engraving an image in stucki mode the laser does not turn off during overscanning

[distebia]

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Hi, I use esp32 with mks dlc32, grblhal with latest firmware installed...if I work an image in grayscale mode no problem but if I work the same image in stucki mode, or any other image mode, I get small lines beyond the image, both on the right and left...it's as if the laser doesn't turn off in stucki mode, but my settings are only on at 90% and 0%...at zero the laser shouldn't draw these lines