I get this issue when I want to append a song while I am playing another song.
I try to press the three dots button on the right side of the screen to append a song to the current playlist.
The three dots button on the right is too small. It's very easy to miss it. When I miss it, the app starts playing that song immediately, and it ruins the playlist.
The button should be larger and easier to press.
See screenshot: https://imgur.com/a/Y4fgWgz

Thanks