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
ShotcutAlpha|690x408

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
shotcut_2020-05-02_09-48-22

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

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