My Glock 48 jams at least once per magazine with the shield mags when I used them on the mainland, and that was with all 3 mags. Though I was using the regular plastic mag release. I didn't have time to test the metal one.
whether it's the metal or the plastic mag release, shouldn't make a difference in feeding reliability. if you're using the OEM plastic mag release with the metal mags, the mag catch slot on the mag, the metal edge, it'll chew up the plastic mag release. the mag catch will work, but eventually the plastic mag catch will fail. nothing to do with feeding, though. other than the mag slipping down, eventually.
and conversely, if you're using the metal mag release with the OEM-style plastic-covered mags, the metal mag release will chew up the plastic covering of the OEM mags. it'll work, but it's a longevity thing. eventually the ledge in the mag will be rounded off, chewed off. mag might not seat at the right height for reliable feeding.
therefore, the metal mag release with metal mags. and I guess, plastic mag release with plastic mags.
since the G43 mag release can be installed either LH or RH, I installed mine RH, and rounded, smoothed the lower sharp edge on the mag catch before installation, meh, it won't work if reversed and LH installed now, but I'm not LH either, so no biggie. so if I ever had to use the plastic-coated mags, they ought to survive since no sharp metal edges to gouge out the plastic. also makes for smoother, easier mag insertion. In any event, regardless, I went all-in, and bought several of the Z9 mag 3-packs, lotta mags to test. all my OEM mags went in a box.

i also replaced the mag release spring rod with a reduced power 2.5# spring (RYG), so that I could use the thumb knuckle to pop the mag release without changing my grip. IMHO, the G43 OEM mag release spring was kinda stiff, required hand gymnastics to drop the mag. YMMV