Firing with a Gravi-Beamer weapon gives you an Aggressor status for 30 seconds.
If target self destructs or gets killed, you do not become a criminal.
Anyway, this is a simple bug.
Game logs are not needed.
All you need to do to replicate this bug is to invite someone in your group and he or you must have a Gravi-Beamer weapon equipped to fire on each other.
However, if one of you gets destroyed, there shouldn’t be any consequences with 300 criminal seconds.
Thank you, Skula1975.