These may be oversampling artifacts ‘cos the plugin can’t decide which pixels go to which card. Not really much you can do about it. You could try to scale up your footage to twice the size in a pre-compand of course double all your sizes for the cards and Mosaic. This should improve the situation a bit. Then simply scale ther pre-comp-down again. When scaling up, set the layer to draft quality so pixels are only doubled, not interpolated, to maintain crispness.
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