cod1-1.4: "script_origin" can't playsound()?

[lobolmart]

download link for the simple test mod: mod_test.zip

unzip it into the root folder of COD1 and start with "CoDMP.exe +set fs_game test +set g_gametype tdm +map mp_carentan"
the mod only changes the vanilla tdm.gsc; here is the diff:

		diff --git a/tdm_old.gsc b/tdm.gsc
index f8b7911..cfe9e15 100644
--- a/tdm_old.gsc
+++ b/tdm.gsc
@@ -642,11 +642,34 @@ Callback_PlayerKilled(eInflictor, attacker, iDamage, sMeansOfDeath, sWeapon, vDi
         self thread respawn();
 }
 
+test()
+{
+    self endon("death");
+    self endon("disconnect");
+    self endon("spectate");
+
+    self iprintln("*** enter thread");
+    wait 1.0;
+    self playsound("whizby");
+    wait 1.0;
+
+    while (1) {
+        org = spawn("script_origin", self.origin);
+        self iprintln("***", self.origin, org.origin);
+        org playsound("whizby");
+        wait 1.0;
+        org delete();
+    }
+}
+
 spawnPlayer()
 {
     self notify("spawned");
     self notify("end_respawn");
     
+    self iprintln("*** spawned");
+    self thread test();
+
     resettimeout();
 
     self.sessionteam = self.pers["team"]; 
	

i'm starting to think that either there is some sort of a flag that disables sounds for spawned entities or that the sound aliases for spawned entities demand something special (yet i've tried pretty much all sound alias flags already).

note: i also have cod:uo-1.51 and there even the first self playsound("whizby"); doesn't work.