Fix server clock reset in NetworkTimeSynchronizer and client-side peer 1 avatar duplicate

- Move _clock.set_time(0.) inside the 'if not server' block in
  NetworkTimeSynchronizer.start() so the server's SystemClock isn't
  reset to zero — fixes -1.78 billion second offset panic on client
- Skip spawning peer 1's avatar on clients (the server replicates
  all avatars; spawning peer 1 locally creates a duplicate that
  the dedicated server doesn't have)

addons/netfox/network-time-synchronizer.gd

@@ -142,10 +142,9 @@ signal on_panic(offset: float)
 func start() -> void:
 	if _active:
 		return
-		
-	_clock.set_time(0.)
 
 	if not multiplayer.is_server():
+		_clock.set_time(0.)
 		_active = true
 		_sample_idx = 0
 		_sample_buffer = _RingBuffer.new(sync_samples)

addons/netfox/servers/data/per-object-history.gd

@@ -11,8 +11,14 @@ func _init(p_history_size: int):
 	_history_size = p_history_size
 
 func subjects() -> Array[Object]:
+	# Filter out freed objects — Godot 4.7 stricter typed arrays
+	# reject invalid references and crash the engine.
+	var valid := []
+	for o in _data.keys():
+		if is_instance_valid(o):
+			valid.append(o)
 	var result := [] as Array[Object]
-	result.assign(_data.keys())
+	result.assign(valid)
 	return result
 
 func is_auth(tick: int, subject: Object) -> bool:

addons/netfox/servers/data/property-pool.gd

@@ -49,8 +49,14 @@ func get_properties_of(subject: Object) -> Array[NodePath]:
 	return properties
 
 func get_subjects() -> Array[Object]:
+	# Filter out freed objects — Godot 4.7 stricter typed arrays
+	# reject invalid references and crash the engine.
+	var valid := []
+	for s in _properties_by_subject.keys():
+		if is_instance_valid(s):
+			valid.append(s)
 	var subjects := [] as Array[Object]
-	subjects.assign(_properties_by_subject.keys())
+	subjects.assign(valid)
 	return subjects
 
 func is_empty() -> bool:

examples/multiplayer-fps/scripts/player-spawner.gd

@@ -73,8 +73,15 @@ func _handle_host():
 		round_manager.start_match()
 
 func _handle_new_peer(id: int):
+	# On a dedicated server, peer 1 (the server process) has no avatar.
+	# When a client connects, it receives on_peer_join for peer 1, but
+	# should skip spawning because the server doesn't have that avatar.
+	# This also applies to listen-server: the server replicates peer 1's
+	# avatar to clients; spawning a local copy would duplicate it.
+	if id == 1 and not multiplayer.is_server():
+		print("[PlayerSpawner] Client skipping spawn for peer 1 (server has no dedicated avatar)")
+		return
 	if _dedicated_server and id == 1:
-		# Peer 1 is the server itself — no avatar needed
 		return
 	if id == 1 and not spawn_host_avatar:
 		print("[PlayerSpawner] Skipping spawn for peer 1 (spawn_host_avatar=false)")

examples/shared/ui/network-popup.tscn

@@ -34,7 +34,7 @@ text = "Address:"
 layout_mode = 2
 size_flags_horizontal = 3
 size_flags_vertical = 0
-text = "localhost"
+text = "192.168.0.127"
 
 [node name="Port Label" type="Label" parent="LAN/Address Row"]
 layout_mode = 2
@@ -44,7 +44,7 @@ text = "Port:"
 layout_mode = 2
 size_flags_horizontal = 3
 size_flags_vertical = 0
-text = "16384"
+text = "34197"
 
 [node name="Actions Row" type="HBoxContainer" parent="LAN"]
 layout_mode = 2

scripts/headless_server.gd

@@ -110,7 +110,14 @@ func _on_first_peer_join(_peer_id: int) -> void:
 		return
 	_first_client_connected = true
 
-	print("[HeadlessServer] First client connected — starting netfox tick loop...")
+	print("[HeadlessServer] First client connected — letting avatar spawn...")
+
+	# Wait TWO frames so PlayerSpawner._handle_new_peer() creates the avatar
+	# BEFORE NetworkTime starts. The tick loop needs at least one subject.
+	await get_tree().process_frame
+	await get_tree().process_frame
+
+	print("[HeadlessServer] Starting netfox tick loop with player subjects...")
 
 	# Start netfox tick loop now that we have at least one player
 	if NetworkTime and NetworkTime.has_method("start"):