asw1-eqsin generated a coredump for l2cpd
After investigation with JTAC, it matches an internal PR where a specific LLDP frame received on em0 made the process crash. The bug is fixed on any recent Junos version.
The main risk here is that l2cpd also controls LACP, so a crash could cause use facing issues. However the previous crash didn't, so setting the priority to medium.