The signature changes are in motion, they'll be back.
@jackophant do you have an example of a Steam image I can test with?
@LizardPL it's generally hitting RETURN that triggers the image to be inserted, if you're not doing it via the 'Insert other media' button. From looking at your screenshot it's possible that they ended up as clickable links instead, which might be due to how the web browser copied them (Chrome likes doing this unless you select 'paste as plain text' when right clicking) or the editor just getting confused. If you remove the link and/or press RETURN at the end of the URL it might fix it. Also if you have the URL to that post I can take a look.