Image type cover does not function well

In all page builders, when choosing image style ‘cover’ the image fills the given size by cropping the image, without distortion. In GenerateBlocks (pro) whatever I do, the given image px sizes are not respected. Nearly impossible to create a few identical columns with different images; vertical alignment is right now only possible when using images with exactly the same sizes. Silly; that’s why ‘cover’ exists.

But even more strange; if we are using a GenerateBlocks container in stead of an image block, and giving it a background image, with the same px sizes we tried in de imageblock and selecting ‘cover’: it all works as it should be. I know now we can accomplish a ‘normal’ cover image by ignoring the image block and using a container, but is a bit strange.