After auto-updating to 5.5 my WordPress site got ugly from day one and I didn’t even detect it. All the images were distorted, the aspect ratio of the image was not being respected. Googling didn’t immediately reveal the problem, so here is how I finally quick-fixed it:
Go to Appearance / Customize / Additional CSS and paste in the following snippet:
img {
max-width: 100%;
height: auto;
}
Dear WP devs, would you pls be so kind and test before rolling out. Breaking changes like this should get more public attention.