CharacterController.IsGrounded seems buggy

[codeabuse]

Release Type: Official Release
Version: 4.2.0.2381
Platform(s): Windows 10

I created a new project from First Person Shooter template and started from adding Jump to PlayerController script:
(the event stuff is outside of the scope, Jump is called from Update)

private void Jump()
{
    if (character.IsGrounded)
    {
        if (isJumping)
        {
            Log.Info("Landed");
            isJumping = false;
        }
        jumpEventListener.TryReceive(out var jumpPressed);
        if (!jumpPressed)
        {
            return;
        }
        var jumpDirection = new Vector3(moveDirection.X, 1, moveDirection.Z);
        jumpDirection.Normalize();

        character.Jump(jumpDirection * JumpHeight);
        isJumping = true;
        Log.Info("Jumping!");
    }
    else Log.Info("In air!");
}

To me it seems like the CharacterController's IsGrounded property is hella bugged since I can just hold Space key and fly up, which obviously shouldn't happen.

To Reproduce
Steps to reproduce the behavior:

1. Create new project from First Person Template
2. Extend PlayerController with my method, hook it up to Jump key event from PlayerInput.

Expected behavior
Jump works.

Screenshots
Here's the screenshot of a single short key press result (multiple landings and jumps after it did not happened because of the input):

From what I'm seeing it jumps three times per key stroke, for that it also lands three times because it detects grounded state while being midair.

[DockFrankenstein]

I've ran into this before. The problem is that IsGrounded just checks if the vertical velocity is equal to 0. This is true when you are on the ground but also when you go from ascending to decending.

I recomend doing the ground check manually by seeing if there is something right below the character controler.

[codeabuse]

I've ran into this before. The problem is that IsGrounded just checks if the vertical velocity is equal to 0. This is true when you are on the ground but also when you go from ascending to decending.

This is amazing, thanks. Never seen this approach in gamedev xD
I thought this IsGrounded is a honest one. Will dig into colliders and collision normal check.