Merge pull request #25010 from Faless/mp/fix_init

Fix MultiplayerAPI initialization, clear, set_network_peer.

core/io/multiplayer_api.cpp

@@ -122,6 +122,7 @@ void MultiplayerAPI::clear() {
 	connected_peers.clear();
 	path_get_cache.clear();
 	path_send_cache.clear();
+	packet_cache.clear();
 	last_send_cache_id = 1;
 }
 
@@ -131,6 +132,8 @@ void MultiplayerAPI::set_root_node(Node *p_node) {
 
 void MultiplayerAPI::set_network_peer(const Ref<NetworkedMultiplayerPeer> &p_peer) {
 
+	if (p_peer == network_peer) return; // Nothing to do
+
 	if (network_peer.is_valid()) {
 		network_peer->disconnect("peer_connected", this, "_add_peer");
 		network_peer->disconnect("peer_disconnected", this, "_del_peer");
@@ -857,6 +860,8 @@ void MultiplayerAPI::_bind_methods() {
 }
 
 MultiplayerAPI::MultiplayerAPI() {
+	rpc_sender_id = 0;
+	root_node = NULL;
 	clear();
 }