If you add multiple media in the play queue, play one of the media (except for the last one, and with the randomizer option disabled), and remove it from the play queue (by swiping) while it is playing, the play animation doesn't show next to the new currently playing media.
That text probably wasn't understandable enough so I've also made the video https://m.youtube.com/watch?v=FqynFOiqYVE.
This is just a visual bug (and a way to make VLC even better), it shouldn't be a priority to fix it. It happened in both the beta version and today's nightly version. The video also shows two other strange things that can happen with the play animation, but I currently don't have enough informations about how to reproduce these bugs.