Impress keep crashing when I play a slide show that have newer slide transitions such as helix, iris, ripple. I am now currently using libreoffice 7 Linux mint 20. I never had such serious issue with impress before. I tested it again on libreoffice 18.104.22.168 on Linux 19.3 and it similarly the libreoffice crashed as well.
Sometimes even applying the transitions will crash.
I have no problem running the slides when I removed all the slide transitions.
I had been using libreoffice since Star Office days.