Temporary code for debugging ShadowfallStudios#258 shaking tool problem:

    DedicatedServer rotation is driven by client RPC now, because curve driven rotation is only available when VisibilityBasedAnimTickOption is set to AlwaysTickPoseAndRefreshBones(AFAIK), so we need a more general approach. (it's a naive approach but should be enough for debugging, for a formal solution see CallServerMovePacked, FCharacterNetworkMoveData)

Source/ALSV4_CPP/Private/Character/ALSBaseCharacter.cpp

@@ -1057,6 +1057,12 @@ void AALSBaseCharacter::UpdateGroundedRotation(const float DeltaTime)
 		}
 		else
 		{
+			if (IsNetMode(NM_DedicatedServer))
+			{
+				// DedicatedServer rotation is driven by client RPC
+				return;
+			}
+
 			if (GetLocalRole() == ROLE_SimulatedProxy)
 			{
 				// const FScopedPreventAttachedComponentMove PreventMeshMove(GetMesh());
@@ -1079,15 +1085,13 @@ void AALSBaseCharacter::UpdateGroundedRotation(const float DeltaTime)
 			if (const float RotAmountCurve = GetAnimCurveValue(NAME_RotationAmount);
 				FMath::Abs(RotAmountCurve) > 0.001f)
 			{
+				TargetRotation.Yaw = UKismetMathLibrary::NormalizeAxis(
+					TargetRotation.Yaw + (RotAmountCurve * (DeltaTime / (1.0f / 30.0f))));
+				SetActorRotation(TargetRotation);
+
 				if (GetLocalRole() == ROLE_AutonomousProxy)
 				{
-					TargetRotation.Yaw = UKismetMathLibrary::NormalizeAxis(
-						TargetRotation.Yaw + (RotAmountCurve * (DeltaTime / (1.0f / 30.0f))));
-					SetActorRotation(TargetRotation);
-				}
-				else
-				{
-					AddActorWorldRotation({0, RotAmountCurve * (DeltaTime / (1.0f / 30.0f)), 0});
+					Server_SetActorRotation(TargetRotation);
 				}
 				TargetRotation = GetActorRotation();
 			}
@@ -1105,6 +1109,12 @@ void AALSBaseCharacter::UpdateGroundedRotation(const float DeltaTime)
 	// Other actions are ignored...
 }
 
+void AALSBaseCharacter::Server_SetActorRotation_Implementation(const FRotator Rotator)
+{
+	TargetRotation = Rotator;
+	SetActorRotation(Rotator);
+}
+
 void AALSBaseCharacter::UpdateInAirRotation(const float DeltaTime)
 {
 	if (RotationMode == EALSRotationMode::VelocityDirection || RotationMode == EALSRotationMode::LookingDirection)

Source/ALSV4_CPP/Public/Character/ALSBaseCharacter.h

@@ -388,6 +388,9 @@ class ALSV4_CPP_API AALSBaseCharacter : public ACharacter
 
 	void UpdateGroundedRotation(float DeltaTime);
 
+	UFUNCTION(Server, Reliable)
+	void Server_SetActorRotation(const FRotator Rotator);
+
 	void UpdateInAirRotation(float DeltaTime);
 
 	/** Utils */