Impress Exit animation not working (MacOS 25.8.1.1.)

Trying to animate a presentation.
Whatever I do, it seems I can’t get any of the “exit” animations to work, when trying to fade out elements on a slide.
Is it me? Is it a bug?
Thanks for your help!
Alex

#More_details Ask/Guide - How to use the Ask site - The Document Foundation Wiki

109362 – (Object-Animations) [META] Custom/object animation bugs and enhancements
  → Dependency tree for Bug 109362
139897 – (PPTX-Animations) [META] PPTX Object animation issues
  → Dependency tree for Bug 139897