I am setting up a single particle simulation with periodic boundary conditions (PBC) in LIGGGHTS-PUBLIC v3.8.0 and find that the atom is getting lost once it crosses the boundary for a triclinic box. This does not happen when I use LIGGGHTS-PUBLIC v3.5.0 or v3.4.1 for instance.
Please take a look at the input script attached that shows the behaviour described above. This atom is not lost if "block" is used instead of "prism" in my input script. I don't understand why this is happening, and perhaps it may be a bug.