Issue with transparent logo

Hello, I’m having an issue with a transparent logo, on a video since I updated Shotcut.
Track 1: There’s my video.
Track 2: There’s my logo. White, with a transparent background, and a filter of opacity to make it more transparent looking.

I see it correctly on my screen… But when I export my video, there’s a white, semi-transparent square where my logo is supposed to be. Do you know where it may comes from?

Thanks in advance.

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