Particles disappear when using the particle tracer filter
 

Hello,

I'm running Paraview 5.4 with OpenFOAM v6 and I've come across a problem with the particle tracer filter. Particles are generated at the beginning of the simulation, but then are promptly removed from the domain for some reason. This isn't a visualization issue, I've confirmed that points are disappearing using the spreadsheet view. For example, with a plane source, after a second of simulation time, around 30 particles remained out of the original 400.

Can anyone guess why this may be happening?