Errors when despawning a NetworkRigidBody3D with MultiplayerSpawner

[Azengar]

🐛 Description

Upon calling queue_free() on a NetworkRigidBody3D that has a RollbackSynchronizer managed by a MultiplayerSpawner, the node is correctly deleted on server and then client but prints 3 errors on the client:

E 0:00:06:184 get_node: Node not found: "Level/Balls/Ball/RollbackSynchronizer/Node" (relative to "/root").
<C++ Error> Method/function failed. Returning: nullptr
<C++ Source> scene/main/node.cpp:1907 @ get_node()
E 0:00:06:184 get_cached_object: Failed to get cached node from peer 1942538544 with cache ID 5.
<C++ Error> Parameter "node" is null.
<C++ Source> modules/multiplayer/scene_cache_interface.cpp:291 @ get_cached_object()
E 0:00:06:184 process_rpc: Invalid packet received. Requested node was not found.
<C++ Error> Parameter "node" is null.
<C++ Source> modules/multiplayer/scene_rpc_interface.cpp:208 @ process_rpc()

If the RollbackSynchronizer is removed then the issue disappears.

Unsure if that's relevant but I use Rapier3D deterministic physic with the netfox driver.

Steps to reproduce

1. Create a scene with a MultiplayerSpawner that spawns another scene.
2. Make the spawned scene a NetworkRigidBody3D with a RollbackSynchronizer.
3. Create and delete one of the spawned rigidbodies via queue_free().

Expected behavior

1. No errors should be printed.

Observed behavior

1. Errors appear, as pasted above.

Versions

• Godot version: 4.5-stable
• netfox version: From sources, main-7c1e9eff915bc46cef5b433398c9801367446071

Notes

MRE

I provide a small reproducible project here (Couldn't upload it in the issue for some reason): https://filebin.net/13bncd13928jb95u