If you…
- post an image, manually setting the size
- edit the post and change the size
…sometimes, a few seconds after editing, your image reverts to the original size.
Recording from try.discourse.org:
Editing image sizes manually in HTML is not supported. So this is by design at the moment.
If you want a differently sized image, resize the image in an image editor.
Then I find it fascinating that it is working most of the time. Well done, even if unintended 
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