When viewing images they are often a bit wide-stretched until they are loaded completely.

Steps to reproduce:
Go to Images and navigate them.

Expected behavior:
Have the correct dimensions from the beginning

Debug info:
Safari, Firefox/ Mac/ EUROPE-WEST2

eltaco Can you show a video of this?

a quick fix for modern browsers would be this CSS rule:

.image-preview-wrapper .image-preview-images > div img { object-fit: contain; }