Hi
I don’t know if this is truly a bug or if it is working as intended. But, I have some minor problems with “Featured Images” in the Archives pages. When you create a new post, the featured image for the archive pages is not generated yet, so it will show the wrong dimension until you hit F5. If you are using caching like me, you will need to flush the cache as well to make it generate the right dimension.
Also, I did a clean up and used a plugin to delete all unused image sizes and regenerate thumbnails. This resulted in the images used for the features image on the archive page to be deleted as well, because it is need specified via “add_image_size” function.