UE 5.2 - FOnTimelineFloat with FRichCurve doesn't work anymore

Development Programming & Scripting C++
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1

Hi. I have just updated my UE from 5.0 to 5.2. And my timelines in C++ code stopped working. Here is my code:

URecoil::URecoil()
{
    // Create recoil timeline
    m_timeline = CreateDefaultSubobject<UTimelineComponent>("RecoilTimeline");

    // Yaw curve
    m_yawCurve = CreateDefaultSubobject<UCurveFloat>("YawCurve");
    FOnTimelineFloat yawCallback;
    yawCallback.BindUFunction(this, "yawCallback");
    m_timeline->AddInterpFloat(m_yawCurve, yawCallback);
    // Pitch curve
    m_pitchCurve = CreateDefaultSubobject<UCurveFloat>("PitchCurve");
    FOnTimelineFloat pitchCallback;
    pitchCallback.BindUFunction(this, "pitchCallback");
    m_timeline->AddInterpFloat(m_pitchCurve, pitchCallback);
}
...
void URecoil::start(const FRichCurve &yawCurve, const FRichCurve &pitchCurve)
{
    if (!m_receiver)
        return;

    // Configure curves
    m_yawCurve->FloatCurve = yawCurve;
    m_pitchCurve->FloatCurve = pitchCurve;
    // Start timeline
    m_timeline->PlayFromStart();
}

Curves are created in other code. Example:

FRichCurve yaw;
    yaw.SetKeyInterpMode(yaw.AddKey(0.0f, 0.0f), ERichCurveInterpMode::RCIM_Cubic);
    yaw.SetKeyInterpMode(yaw.AddKey(RECOIL_TIME, FMath::FRandRange(0.3f, 0.4f)), ERichCurveInterpMode::RCIM_Cubic);

This code worked fine in 5.0. But now I see that callback functions yawCallback and pitchCallback are called twice with zero values.

Any ideas how to fix it? Timelines with curves from content browser work good.

2

I replaced curves creation code from constructor to BeginPlay:

void URecoil::BeginPlay()
{
    Super::BeginPlay();

    // Yaw curve
    m_yawCurve = NewObject<UCurveFloat>();
    FOnTimelineFloat yawCallback;
    yawCallback.BindUFunction(this, "yawCallback");
    m_timeline->AddInterpFloat(m_yawCurve, yawCallback);
    // Pitch curve
    m_pitchCurve = NewObject<UCurveFloat>();
    FOnTimelineFloat pitchCallback;
    pitchCallback.BindUFunction(this, "pitchCallback");
    m_timeline->AddInterpFloat(m_pitchCurve, pitchCallback);
}

and looks like timeline works again. What is the difference between creating these objects in constructor or in BeginPlay?