I used to resize images (editing width and height when writing the post) in order to avoid ridiculously large images in reading published post.
Since a few weeks, that does not work anymore.
When I edit, I see the reduced size in Live Preview:
But once posted, images are much larger as seen below:
Looks like the image is now resized to fill full width.
I filed a bug report: Dec 27, 2025 at 1:43 PM – FB21446929
PS: that change ignores @eskimo wise advice "Quinn’s Top Ten DevForums Tips" n°10 (https://developer.apple.com/forums/thread/706527).