[app bug?] Loop playing in playlist not working on app

Is it just me or the loop playing feature in playlist doesn’t work on the app, iphone or ipad.
No matter how many times I‘ve repeated clicking the loop button, it just doesn’t work as expected. I would always be taken to the next item after the previous one is played. I even tried deleting my app and redownloading it, but it doesn’t work either.
Please share with me what I can do. It’s such a big trouble as I cannot keep listening to the same material.

Can anyone help please?