ZDoom

Upon hitting non-bleeding actors, projectiles enter the Crash state if it exists. If it doesn't, they enter the XDeath state if it exists. And if that doesn't exist, then the Death state is entered.

actor rocket2 : rocket replaces rocket
{
  States
  {
	XDeath:
	BON1 AB 8
	Stop
  }
}

actor nonbleedingimp : doomimp replaces doomimp
{
  +NOBLOOD
}

actor nonbleedingzombieman : zombieman replaces zombieman
{
  +NOBLOOD
}

Try using this .wad and shooting an explosive barrel with the rocketlauncher, the rockets should go into their XDeath states and turn into health bonus sprites briefly. I also replaced zombiemen and imps with +NOBLOOD versions so the bug can be observed on them, too.

This behaviour seems to have been around for a long time, so it could be intentional?

[code]actor rocket2 : rocket replaces rocket
{
States
{
XDeath:
BON1 AB 8
Stop
}
}

actor nonbleedingimp : doomimp replaces doomimp
{
+NOBLOOD
}

actor nonbleedingzombieman : zombieman replaces zombieman
{
+NOBLOOD
}[/code]