I can repro this, oddly Safari doesn’t seem to want to scale icons… this doesn’t happen everywhere, it seems to have something to do with multiple nested font-size declarations (which are hard to avoid!)
It looks like this has been reported as a bug, which was at one point fixed, and then reverted recently
Yes, 287302@main reverted the fix. No one is actively working on this bug.
I guess one thing we can do is use width/height instead of font-size on svgs to avoid it