Layers don't scale when first created.
Not sure where the right place to post this is, but I was playing with the resizing feature in Sketch. When the layer is first created, it doesn't resize based on the preview from the resizing panel. It matches what would happen if you set fixed size on both width & height even though it's not described. As a user, I can fix this by selecting & deselecting a property in the resizing panel. I will check the JSON file generated from Sketch to see if the resize values are incorrect as well.

https://user-images.githubusercontent.com/13757212/120027761-02ade700-bfb1-11eb-910b-6fa783902ecd.mov

Sketch Version: 72.3