I’m also experiencing this problem. Other players in the native multiplayer display this same ‘blocky’ contrail no matter their altitude, so even when they taxi it appears for me and is quite immersion breaking. Also appears on my own aircraft, original MSFS contrail shows fine for a bit and then this other ‘blocky’ texture appears half way down. Here’s a few screenshots. Not sure if this is an addon causing this or an MSFS bug.
