Gap in newly filled area in CW2 motor plate

[jagerman]

When slicing the new CW2 motor plate, I noticed an unexpected bit of bridging in the sliced model:

The bridging is at height 6.2 (occurs in current versions of PrusaSlicer and OrcaSlicer; I didn't try other slicers):

and if I look at height 6.0 I see exactly one layer of the older motor plate shape:

It seems that the old shape is not quite completely filled in by the new one and so the slicer is still drawing the old shape for one layer before switching to the new filled-in shape.