[Bug] Synced Scenes are client sided only.

[trhi2409]

Summary

A synchronized scene plays correctly on the player that creates it and 'invisible' to every other client.
Server never receives the synced scene net game events ( startNetworkSyncedSceneEvent, stopNetworkSyncedSceneEvent)

Issue type

Both / Unsure

Repro rate

Always

Server build version

FXServer-early-access b139 win32

OS

No response

CPU

No response

GPU

No response

RAM

No response

Storage type

None

Connection type

None

ISP and bandwidth

No response

DxDiag

No response

Network graph

No response

Platform

None

OS version / distribution

No response

CPU

No response

RAM

No response

Using txAdmin?

None

Hosting provider

None

Machine type

None

/perf endpoint output

No response

DDoS protection

No response

ulimit -n value (Linux only)

No response

Docker Compose file (Docker only)

No response

Steps to Reproduce

1. Join a server with two clients (or 2 players), standing next to each other
2. Run /scenetest with client A
3. Server not printing anything, client B doesn't see the backflip

Expected Behavior

All players should see the synced scene, server should also invoke the startNetworkSyncedSceneEvent and stopNetworkSyncedSceneEvent net game events.

Actual Behavior

The player that initiated the scene sees it correctly
Other players sees nothing at all (Sees the original player standing idle)
Server doesn't invoke the game events

Evidence

server.lua

AddEventHandler('startNetworkSyncedSceneEvent', function(sender)
    print(('startNetworkSyncedSceneEvent from %s'):format(sender))
end)

AddEventHandler('stopNetworkSyncedSceneEvent', function(sender)
    print(('stopNetworkSyncedSceneEvent from %s'):format(sender))
end)

client.lua

RegisterCommand('scenetest', function()
    local ped, dict = PlayerPedId(), 'anim@arena@celeb@flat@solo@no_props@'
    local c, h = GetEntityCoords(ped), GetEntityHeading(ped)

    RequestAnimDict(dict)
    while not HasAnimDictLoaded(dict) do Wait(0) end

    local scene = NetworkCreateSynchronisedScene(c.x, c.y, c.z - 1.0, 0.0, 0.0, h, 2, false, false, 1.0, 0.0, 1.0)
    NetworkAddPedToSynchronisedScene(ped, scene, dict, 'flip_a_player_a', 1.5, -4.0, 261, 0, 1000.0, 0)
    NetworkStartSynchronisedScene(scene)
    print(('network scene handle %d'):format(scene))

    Wait(4000)
    NetworkStopSynchronisedScene(scene)
    print('stopped')
end)

Additional Context

Also tried with
https://forum.cfx.re/t/tutorial-snippet-simple-way-to-use-network-synchronized-scenes/5150424
Same code, working correctly on Legacy, not syncing to players in Enhanced.

What seems interesting is the handle NetworkCreateSynchronisedScene returns.
For the client with server ID 1 it was 0 on Legacy and 64 on Enhanced.
0 is what this produces, in the Legacy tree
(NetworkSynchronisedSceneHacks.cpp#L53-L56):

static uint32_t GetSceneIdOffset(CNetGamePlayer* player)
{
	return (DoGetServerId(player) - 1) * 64;
}

64 is what stock GTA produces physicalPlayerIndex * 64 at index 1 as if
that remap were not applied.

[Nobelium-cfx]

I can confirm that the issue is there. Seems like we got a regression in synced scenes somewhere along the development. Working on the fix now

[Nobelium-cfx]

Found the issue. A fix should be included in the next release. Thank you for reporting it!

PS: The ID difference is not related to the issue and is intentional.