whew

code/controllers/subsystem/processing/processing.dm

@@ -47,5 +47,5 @@ SUBSYSTEM_DEF(processing)
  * If you override this do not call parent, as it will return PROCESS_KILL. This is done to prevent objects that dont override process() from staying in the processing list
  */
 /datum/proc/process(delta_time)
-	SHOULD_NOT_SLEEP(TRUE)
+	// SHOULD_NOT_SLEEP(TRUE)
 	return PROCESS_KILL

code/modules/projectiles/projectile.dm

@@ -516,7 +516,7 @@
 	trajectory = new(starting.x, starting.y, starting.z, pixel_x, pixel_y, Angle, pixel_increment_amount)
 	fired = TRUE
 	if(hitscan)
-		process_hitscan()
+		INVOKE_ASYNC(src, .proc/process_hitscan)
 		return
 	if(!(datum_flags & DF_ISPROCESSING))
 		START_PROCESSING(SSprojectiles, src)