The WMF core features team tracks this bug on Mingle card https://mingle.corp.wikimedia.org/projects/flow/cards/377, but people from the community are welcome to contribute here and in Gerrit.

I've definitely seen this before (with just the normal "click on pencil icon" editing, not even new-tabbing/link-following). I believe Matthias or Erik mentioned that this is the expected non-JS fallback behavior, so it's probably a case of Flow sporadically dropping JS on the floor.

https://www.youtube.com/watch?v=gAYL5H46QnQ

Not sure what/who fixed it, but it works fine now :)

You can still get to an action=edit-post URL if you right-click on a post's permalink icon, or if you have JavaScript disabled.

The current set of glitches is slightly different:

• page title doesn't say I'm editing
• no link back to the topic or to the board (this is "improve page navigation", https://trello.com/c/yal21Kkh/47-improve-page-navigation )
• no preview
• after clicking this I see the updated post in context in its topic (good),

but the timestamp on the post remains 10 hours ago

• I think we agreed a post should always be shown in context within its topic.