The message was deleted, but the button under it did not update (from a bin icon to a undo icon) until I refreshed the page.
Using Firefox 115.0.2, Windows 10
Hi Danny. 
Are you able to reproduce this issue in any other browser or OS? It is working for me in Firefox and Fedora. 
I now cannot reproduce it on the original system.
I attempted to do this my starting the tutorial again, in the same thread.
It is unclear to me whether I would be able to reproduce it on the original system with a blank slate thread.
I also attempted to reproduce this on:
Fairphone 3(+) Android 13 (6.A.018.0)
Firefox: 115.2.0 (Build #2015961523), ff36f634f8+ GV: 115.0.2-20230710165010 AS: 115.0
and could not reproduce it (with the same above caveat).
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I’ve slipped this over to support, but if it turns out it wasn’t just a blip and you can get some repro steps we can move back again. 
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OK.
For clarity: no support is needed. I was just reporting a bug.
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