I worked around this by styling the LinearGradient view with { position: 'absolute' }.

Code snippet:

<LinearGradient
  style={{
    position: 'absolute',
    left: 0,
    bottom: 0,
    right: 0,
    zIndex: 90,
  }}
  colors={['transparent', 'black']}
  start={{x: 0.5, y: 0}}
  end={{x: 0.5, y: 1}}>