That’s good to know. I would hope a metal anchor to reshape when temp causes expansion. It’s a shame to hear it’s the brick that’s forced to expand. In my case it’s a solid metal rod, so it sounds like the metal is guaranteed to split the brick in a temp change.
It sounds like I have to pull out the shank, bore the hole to 10mm, and either use chemical anchor or fasten it using a sheet metal w/2 nuts.