LogPredictionKey: Warning: UnAck'd PredictionKey 2532 in DelegateMap while OnRep [3336/0]. This indicates keychains are created w/o being sent to & ack'd by the server. Last ack'd key in that slot was [0/0].

[DiaricaGameDev]

Encountered those warning logs before I update engine and project to UE5.4

In Gameplay Ability System
Everytime I tried to activate a gameplay ability, those logs may appear.

[OddOculus]

This is solved in Unreal 5.4.2 which you can pull right now if you’re building from source. Credit to @CodingJodon for answering this question in the Unreal Source #gameplay-ability-system channel.

[DiaricaGameDev]

Those are the commits that caused this issue.
Just a misuse of Warning Log

CommitName : Gameplay FPredictionKey Fixes

[JulienSoy (Zorg)]

What are you referring to when you talk about the “Unreal Source gameplay-ability-system channel”?
I’d love to read the details.

I’m encountering the same problem with the 5.4.1 built from source, and tried to integrate the latest source code change on the github 5.4 branch (there’s basically a single commit after the 5.4.1 release which is this one), but I still get the warning when playing from PIE in client-dedi server configuration…

Any precision on the exact commit that should have fixed the issue?

[OddOculus]

Join the Unreal Source Discord

I’ll leave it up to you to dig further.