@Colin I posted on the Github issue page a case that it happens to me and that I could replicate every time .. and thats is when i use the undo (Ctrl-Z). I posted an animated gif showing how to test.
Node-RED version: v2.2.0
Node.js version: v14.18.2
Windows 10
tested both Firefox and Chrome.
Yes, now, I could replicate it too. by Ctrl-Z between two deploys
Node-RED v2.2.0
Node.js version: v14.17.0
Windows 10
Google Chrome
OK, I didn't realise that you had found a fully repeatable method. Excellent work.
I thought you meant that you thought it was something to do with that but it was not repeatable.
hehe .. my wording was a bit confusing .. i meant it happened to me a few days ago but i didnt report it sooner because i couldnt replicate it. Now that more people saw it also i tested a bit more and managed to find a case. (edited my post on github to explain more clearly)
That explains why, when I looked at it again a minute ago, I could not see why I was confused. 
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