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But it doesn’t prevent pipe work from moving in the wall no matter what the regs say
Regs say "to protect the pipe from structural movement". Which is "from movement in the wall".
Not protecton of the pipe from movement within the wall.
Your original reply missed the important detail of not filling completely around the pipe. @sacredhart was correct in calling it.
The gas pipe has an end feed elbow extending into the sleeve, so whilst it's unlikely, it's still possibly a leak source now or in the future besides the pipe itself aging. If the proposed seal up is better sealed than the inside of the property, any gas will leak inside.
Unlikely a fire risk, as you need a decent flow of gas for a flame. But a slight leak build up can cause a house leveling explosion
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user69121
But it doesn’t prevent pipe work from moving in the wall no matter what the regs say, let’s talk real life her instead of theoreticals. You can disagree all you want but even if he sealed it what’s it gonna do? You seem like the expert. I see far worse on the job regularly from “qualified engineers” and wouldn’t be worrying about triviality like this.
I’d say if the person was breaking into a gas line it would be completely different but your making a mountain out of a mole hill here in terms of real life Over something that might or might not be sealed inside