There's a black square when I render alpha channel in Cycles but not in Eevee

There’s a black square when I render alpha channel that casts onto another alpha channel in cycles:

Notice how the leaves that is over the ‘earth’ has black squares behind them.

It only happens because the ‘earth’ has a layer of ‘clouds.png’

When I tried to render the leaves onto solid objects, the black squares dissapeared. Any ideas on this?

Note that this worked fine on Eevee render:
because it has the settings to change blend mode in the material panel.