Unable to get a transparent backrgound on crop

My son asked for my help to solve a problem he has with Shotcut.
He’s trying to layer a track onto another with a splitscreen like effect.
He cropped half of the top track with the crop:rectangle filter, with padding color set with alpha channel at 0.
But whatever he does, the cropped part stays black. !
What is he doing wrong ?
Thank you

What filter(s) do you have on the clip below?
If no filters on the V1 clip, make sure V2 Track Properties Blend Mode is set to Over

The blend mode was set to “none”. Didn’t know about that. Thank you.

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