Android: Invisible Seekbar Thumb Leaves "Hole" in Seekbar

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I want to make a seekbar thumb completely invisible. However, the following code:

seekBar.getThumb().mutate().setAlpha(0);

makes the thumb not appear, but the thumb appears to make a "hole" in its seekbar, as shown in the image below.

Seekbar with split track

How can one make a thumb invisible without it leaving a gap under it?

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