Release Notes

3.0.0

Preview

Build 1011 (Mar 12, 2026)

• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this build or later

Breaking Changes

• FFusionRoomOptions does not have an InitialWorld property anymore, set the InitialWorld when calling UFusionOnlineSubsystem::StartFusionSession()
• EActionFailureCodes changed and numeric values for enums changed
• UFusionClient::IsConnected() was removed, use UFusionOnlineSubsystem::IsConnected() or UFusionRealtimeClient::IsConnected() instead
• FTimerState was renamed to FFusionTimerState and was moved to FFusionTimerState.h
• The SharedMode::Logging namespace is now in the PhotonCommon namespace
• The SharedMode::CharType and SharedMode::StringType types are now both in the PhotonCommon namespace
• Update plugin code to follow Epics guidelines
• Removed unused RoomName Argument from JoinRandomRoom

What's New

• A new Realtime Matchmaking API was added that replaces the old connection methods, providing full access to Photon Realtime related features
• A LeaveRoom blueprint node was added to leave a Realtime room without disconnecting
• Added support for dynamically adding and removing replicated actor components
• Improved AOI system
• Added a new "Player Attached" ownership mode which means the player actor will be destroyed when they disconnect
• Ability to connect ongoing world to fusion via UFusionOnlineSubsystem::AttachCurrentMap()

Changes

• The Fusion Session is not started automatically when joining a Realtime room anymore, call UFusionOnlineSubsystem::StartFusionSession() to start a Fusion Session after joining a room

Bug Fixes

• Fixed: Prevent erroneous error logs being generated when the non-master client code loads the map via the OnMapLoadPerform callback
• Fixed: Uninitialized memory caused the frame update to never run
• Fixed: Class properties when used in RPCs
• Fixed: Ensure InitialMap loads properly
• Fixed: Update service while in shutdown to allow us to receive the disconnect status
• Fixed: Harden disconnect
• Fixed: Add physics state delta checks to avoid unnecessary network sends
• Fixed: Potential issue when using "Standalone Game" launched from the editor
• Fixed: Potential crash and log spam when leaving a Photon room

Build 835 (Feb 19, 2026)

Bug Fixes

• Fixed: Closing a standalone window sometimes caused a crash
• Fixed: A player would sometimes fail to spawn properly after joining a room at start-up in Unreal 5.4

Build 760 (Feb 12, 2026)

Bug Fixes

• Fixed: Adjust a number of Fusion Blueprint nodes so that the main input parameter defaults to self as they did previously: HasOwner, GetOwner, GetResolvedOwner, IsOwner, CanModify
• Fixed: Fix issue where remote Pawns were being assigned the local PlayerController. Remote Pawns no longer have a PlayerController set

Build 756 (Feb 11, 2026)

Bug Fixes

• Fixed: Fix closing PIE instance crash
• Fixed: Fix issues in seamless travel

Build 720 (Feb 10, 2026)

Breaking Changes

• Correct spelling of "Recieve" to be "Receive" for Fusion RPC functions. Fusion C++ RPC functions need to be renamed from *_Recieve to *_Receive
• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this (build 719) or later.

What's New

• Add support for using Actors, Objects, Classes as RPC parameters
• Connecting to the Photon Cloud supports now choosing the best region based on the players ping
• All edge cases around object life cycles should be solved to provide more consistent replication
• Android support and crossplay support between Android and Windows
• Removed interpolation of replicated properties, the behaviour of Fusion now matches unreals netcode more closely in several regards.
• Property RepNotify's now supports previous value argument.
• Native remote function calls now supported in both blueprint and c++, see documentation for further details. RPCs In Depth

Improvements

• Improved physics prediction and replication further
• All public code should now conform to the unreal formatting standard
• Fusion can now use "Run Under One Process" mode in unreal editor

Bug Fixes

• Fixed: Fix issue where a client may not be reliably informed of an object having its owner removed
• Fixed: Fix a potential issue where an actor would not be properly replicated if it is part of a map and immediately possessed
• Fixed: Prevent an assert triggering when loading into level when using UE 5.4.4
• Fixed: Manually set netdriver world
• Fixed: Issue with map loading when loading the same map again
• Fixed: Map actors now use a consistent hashing for identifying sub components which removes the need for consistent component order on all connected clients.

Build 492 (Jan 12, 2026)

What's New

• Unreal 5.7 support

Bug Fixes

• Fixed: Native pointer usage in member declaration preventing a shipping build

Build 438 (Dec 18, 2025)

Breaking Changes

• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this (build 438) or later.

What's New

• Added full support for the Character Movement Component
• Added internal "string heap" replication system for string and text data
• Added support for networking GameInstance and calling Fusion RPCs on it
• The Actor Role now reports to be either Authority or SimulatedProxy based on whether it can be modified
• The NetMode now reports to be a Client

Improvements

• Object replication model has been updated to reduce bandwidth and improve type support

Bug Fixes

• Fixed: Issue where a replicated Actor reference set to None/nullptr by the authority would not be correctly set on remote clients
• Fixed: Duplicate CreatedLocal existed on derived RootObject, hiding other implementation
• Fixed: RPC regression fix, datatypes not properly serialized
• Fixed: IsOwner and CanModify was not properly evaluating all conditional branches
• Fixed: Race condition on sub-object system during object destruction

Build 354 (Nov 25, 2025)

Bug Fixes

• Fixed: Prevent crash and add error log when running multiple PIE windows in one process

Build 349 (Nov 24, 2025)

• Initial release

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