PCBWay's DFM review says the solder mask dam between U2's 0.5 mm pitch VQFN pads is 0.15 mm after their CAM processing, under their 0.19 mm minimum, while the submitted B_Mask Gerber shows 0.25 mm between openings; the team guesses PCBWay's CAM grows each opening about 0.05 mm per side, but that isn't confirmed, so the design file and what the fab builds disagree.