Unreal Engine Issues

StartPlayInEditorGameInstance doesn't consider bStartInSpectatorMode for client instances

In UGameInstance::StartPlayInEditorGameInstance, the server instance will go through the normal process of creating the URL using BuildPlayWorldURL, which checks the FGameInstancePIEParameters' bSta ...

NetStartup actors may receive old, unreliable multicast RPCs when becoming relevant again with replication graph

Unreliable multicast RPCs won't be processed for connections where the actor isn't relevant (this is checked in UNetDriver::ProcessRemoteFunction). However, UReplicationGraph::ProcessRemoteFunction ...

Crash after enabling iOS Metal Desktop Renderering and then enabling iOS SM5 Preview Rendering Level

Rigidbody world space simulation overwrites scaling of the skeletal mesh

Reproduced 3/3 times. Issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Not a Regression. ...

SetOneWayInteraction functionality has no effect on the simulation

Calling SetOneWayInteraction on a BodyInstance has no effect within the physics engine. The state of the flag is passed in to Chaos but nothing actually uses the value once it is there. It is expe ...

Callback ID lost while using the webview

This is a licensee UDN: [Link Removed] I've reviewed the javascript/native bridge code and I don't see anything obvious.  The fact that it can happen on both mobile platforms might point at some hi ...

[Alias] Reimport of a StaticMesh failed

The user suggest to add the option "Only New Meshes" ...

Network Emulation outgoing dropped packets on client higher than expected

Under certain network emulation settings, it looks like outgoing packets from the client will be dropped in groups (around 4 or more packets at a time) rather than individually. This leads to the ac ...

Non-deterministic cook due to UModel::LightingGuid

The -DiffOnly cook mode shows that the LightingGuid seems to change every cook. In Lyra, there seems to be 48 such assets that change every cook due to this. ...

Reliable Multicast RPC may be called before BeginPlay for character on client

Related to [Link Removed], where calling a multicast RPC in BeginPlay results in the character being spawned on the client with the incorrect role/initial property data. One thing to note: this does ...