That must not be a bug with the aircraft itself. If you went to settings and changed something or were pausing the sim in before it may relate to this. You can reproduce this on any jet engine aircraft on MSFS 2024:
- fly at contrail altitude
- check contrails formed (they likely will appear at the engines)
- go into settings, maybe change something
- go back to the flight
- look again and you will see the results from above
The reason for this is that the camera will move far away from the aircraft which deactivates LOD 0 - as the other LOD levels don’t have nodes used to place effects like this the contrails will be generated at the aircraft center instead.
Unfortunately they won’t refresh their position when the nodes are back so they will stay at this position for the rest of the flight 