Unreal Engine Issues

GAS and single process PIE: modifiable static variables accessed by server and client

See: UAbilitySystemGlobals::HandlePreLoadMap GAS features static variables that are modified by both server and client, thus result in issues in single process PIE where they access the same memory ...

GAS: UGameplayEffect tags async loading race condition

User reported game thread and async loading thread accessing a UGameplayEffect property at the same time:Game thread having loaded a GameplayEffectA and in its PostLoad() updating the property Inher ...

Gameplay ability blueprints cannot be debugged in multiplayer

The object filter in the blueprint debugger can be used to filter breakpoints to a specific instance of an object. This is important for multiplayer because there will be multiple versions of the sa ...

GameplayCueNotify Actors not removed on Clients upon duration-based GameplayEffect expiration

GAS: Mixed replication mode and error in MinimalReplicationTags code

We're on 4.25.4. We recently turned on mixed mode replication for GAS, which seems to work fine and reduce bandwidth as expected. However one of our unit tests started failing with this error messag ...

Gameplay Effect Modifiers with Target Tags are Applied Incorrectly

If you have a Gameplay Effect that uses an Attribute Modifiers, and this modifier has Target Tags specified, the modifier is applied unexpectedly:Adding a Required tag on the Target, the modifier do ...