That looks like it got hit, but those parts do crack in time. Mine are both cracked, but still holding on so well after many years that i haven't even bothered to 3D print new ones.
You can buy slider repair kits for 17€, but if it's only half a year old i would send message to Beyerdynamic and ask if they could send you those for free.
Can't use pretty much any IEM as they do not fit my ears, but I'd stay with my Beyerdynamic DT770. Maybe jump to higher up tier in case of free upgrade, but still stay with Beyerdynamic.