node-red-contrib-deconz has (had) a known issues with prototype pollution affecting the new code editor: 🎉 Node-RED 2.0 Released - #43 by Steve-Mcl
However, I have not seen the behaviour you describe before - though I would not be surprised if this was the result of latest node-red version + version of Monaco + node v18 + old contrib nodes
I suspect however Node V18 would be OK if all your contrib nodes had been updated (since others are using Node V18).
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