Vector Tile Package draws offset polygon symbols at index gridlines

[LindsayRaabe_FPCWA]

I have a Vector Tile Package which I'm about to update, and have discovered an issue with the way symbols for polygons with a boundary offset applied are drawn. As can be seen in the 3 examples below, at some scales, where the Index grid crosses features, the boundaries are being drawn as if the index gridlines are a part of the feature. The 1:50,000 image (the first one) shows the features (the pink lines) drawn correctly. The 2nd isn't. 

LindsayRaabe_FPCWA_0-1667788361869.png

LindsayRaabe_FPCWA_1-1667788381785.png

LindsayRaabe_FPCWA_0-1667788933378.png

You can see in the below screenshot, that this problem exists in FieldMaps too (though manifests a bit differently). 

LindsayRaabe_FPCWA_2-1667788724675.jpeg