[BUG] Error when creating new Sequences

[flo-wolf]

I noticed that this simple snippet produces errors when CreateWrappingSequence() is called again while the Sequence still runs:

private Sequence _innerSequence;

public void CreateWrappingSequence()
{
    Sequence wrappingSequence = Sequence.Create();
    wrappingSequence.Chain(GetInnerSequence());
}

private Sequence GetInnerSequence()
{
    if (_innerSequence.isAlive)
    {
        _innerSequence.Stop();
        Debug.Log("Stopping inner sequence that still runs");
    }

    Sequence innerSequence = Sequence.Create();

    // some tween that runs for three seconds
    innerSequence.Chain(Tween.Custom(0, 1, 3, (t) => { }));

    _innerSequence = innerSequence;
    return innerSequence;
}

The following error appears for the Sequence innerSequence = Sequence.Create() line:

When a tween or sequence is added to another sequence, they become 'nested', and manipulating them directly is no longer allowed.
Use Stop()/Complete()/isPaused/timeScale/elapsedTime/etc. of their parent Sequence instead.

When I remove the _innerSequence = innerSequence; line, the error disappears. Why is this the case? _innerSequence is a value type, and the creation of a new Sequence should not be a problem here. I should be able to just stop the current sequence and create a new one here.

Why am I even stopping the sequence? Because I want to prevent callbacks from being executed from the ongoing sequence (the code above is just a test-case to showcase the problem, my actual use case is more complex)