Problem with categories header since update

Yes, there’s been a recent change to these:

https://github.com/discourse/discourse/pull/34081

There’s nothing to it, but fiddling around with custom css to make it work again with your specific image. (Or better yet, provide an image with a 1:1 ratio.)

Example with:

.category-heading__logo.category-logo.aspect-image {
  width: auto;
  height: 100px; 
}

Might need some tweaks for mobile vs desktop.