How do I remove automatic feathering of shape in Adobe After Effects?
It's all about the little sun icon on each layer, called "Collapse Transformations": 
It chooses whether to display the image as a vector (sharp) or as a bitmap (possibly blurry depending on the resolution of the layer).  There's lots online about it - here's one example: 
https://www.schoolofmotion.com/blog/collapse-transformations-continuously-rasterize-after-effects/