Not sure if it’s intended behavior or a bug, but the %
buttons for scaling images and the actual scaling doesn’t work anymore if the image lacks an alt text, which used to work before a recent (week-ish?) update.
If there are more images in the post and one of them is missing the alt text, if you click its %
buttons it changes the scaling for another image that has the alt text (EDIT: I just changed the category to #bug because, even if the alt text was needed, this shouldn’t happen)
This doesn’t work, but used to:

Adding the alt|
part before the image size fixes it, as expected.
I need to update some topics to adapt to this – or otherwise these images would be at 100% if rebaked eventually – and I realized this could be the case for others as well, hence this post.