I was updating a build plan on my mobile (I forgot to add a build step when I was on my laptop a few hours ago), and I found that there was no way to get back to the build plan page from the build step view page that you are now redirected to after editing a build step:
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I managed to get back to the build plan by hitting back in my mobile browser a couple of times, but this meant hitting back through the edit step form as well.