I keep all my objects as a smart objects in PSD files, and when I need to change something, I go inside smart object and make changes. After latest update to 21.1.1 I noticed that if I go inside smart object, remove mask and "Revel All" to have original image without mask, it changes the size of canvas and smart object image becomes bigger in canvas size, after saving smart object in my original image brake the aspect ratio, looks like instead of changing canvas size of smart object it fit the new image inside same size. I hope I explained clearly.
I attach an image to show what I mean: