Describe the bug
When running simulations of the propagation of the ions under the effect of our dipole GLAD magnetic field using R3BRoot, we see that the trajectories of the ions in vacuum are smoother than in air (as seen in the picture below). It seems to be a problem inherit from FairRoot, do you have any clue regarding the reason of this issue?
Logs / Screenshots

System information (please complete the following information):
- OS: AlmaLinux 9.3 (Shamrock Pampas Cat)
- Compiler: GCC 11.4.1
- Environment: FairSoft jan24