Removes ghosts from the HUDs when they get deleted (#17218)

code/modules/mob/dead/observer/observer.dm

@@ -92,6 +92,7 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 	..()
 
 /mob/dead/observer/Destroy()
+	toggle_all_huds_off()
 	if(ghostimage)
 		GLOB.ghost_images -= ghostimage
 		QDEL_NULL(ghostimage)
@@ -348,6 +349,17 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	for(var/datum/atom_hud/antag/H in GLOB.huds)
 		H.add_hud_to(src)
 
+/**
+ * Toggles off all HUDs for the ghost player.
+ */
+/mob/dead/observer/proc/toggle_all_huds_off()
+	remove_the_hud(DATA_HUD_DIAGNOSTIC_ADVANCED)
+	remove_the_hud(DATA_HUD_SECURITY_ADVANCED)
+	remove_the_hud(DATA_HUD_MEDICAL_ADVANCED)
+	antagHUD = FALSE
+	for(var/datum/atom_hud/antag/H in GLOB.huds)
+		H.remove_hud_from(src)
+
 /mob/dead/observer/proc/set_radiation_view(enabled)
 	if (enabled)
 		seerads = TRUE