Sound to enhance animation doesn't play

Hello,
I would like to enhance an animation with a sound and struggling to have it played.

I select a picture to get animation and pick an animation (entrance / fly in).
Then right click on the animation / effect options / enhancement and pick a sound from the available ones. The sound plays when I play the preview play button next to it.

Then I run the presentation, click, the image flies in as it should but there is no sound.

I am running libreoffice 25.8.3.2 on arch linux.

Can you help please?

Thomas