On images whose height was set to 650px before the update, the image displays properly.
Hi. Sorry, but I doubt very much that it worked before the update, since all the images always had and have 100% default width and auto height. This is the base for responsive behavior. For the behavior that you describe would require auto width. But this has never happened in the code of Helix or SPPB.
Therefore, never set the height, but set the width, and leave the height field empty. For example, set width to 460px and you will get what you want.
Perhaps before the update you had it in the cache and you have not seen the real picture.
width = empty and height = some value should be using only in case of SVG image when it does not have its own width and height atributes in its code
Just a remark for the support team. Why do you try to get admin access to solve such simple things that are not the product issues, but are common web principles instead of just looking at the example of a page containing a problem? Thus spend your time and users. This is extremely not effective. You spent a day and did not solve the problem, instead of spending five minutes and solve the problem.