Get it together (#19444)

code/modules/atmospherics/machinery/pipes/pipe.dm

@@ -38,6 +38,11 @@
 		qdel(parent)
 	parent = null
 
+/obj/machinery/atmospherics/pipe/returnPipenet(obj/machinery/atmospherics/A)
+	if(A)
+		return // It's called by a moving mob that's already in the pipenet
+	return parent
+
 /obj/machinery/atmospherics/pipe/detailed_examine()
 	return "This pipe, and all other pipes, can be connected or disconnected by a wrench. The internal pressure of the pipe must \
 			be below 300 kPa to do this. More pipes can be obtained from the pipe dispenser.<br> \

code/modules/mob/living/carbon/carbon.dm

@@ -548,7 +548,10 @@ GLOBAL_LIST_INIT(ventcrawl_machinery, list(/obj/machinery/atmospherics/unary/ven
 	return
 
 /mob/living/update_pipe_vision(obj/machinery/atmospherics/target_move)
-	if(pipes_shown.len && !(target_move))
+	if(!client) 
+		pipes_shown.Cut()
+		return
+	if(length(pipes_shown) && !target_move)
 		if(!is_ventcrawling(src))
 			remove_ventcrawl()
 	else

code/modules/mob/living/logout.dm

@@ -3,6 +3,7 @@
 	if(ranged_ability && client)
 		ranged_ability.remove_mousepointer(client)
 	..()
+	update_pipe_vision()
 	if(mind)
 		if(!key) //key and mind have become seperated. I believe this is for when a staff member aghosts.
 			mind.active = FALSE	//This is to stop say, a mind.transfer_to call on a corpse causing a ghost to re-enter its body.