Why I Cant si the name and image of the actual song when the phone is blocked?

[Jose Manuel Mora Fallas]

Hi my system is android 6, previously I can watch the song information at the block page of my phone, information like picture, song's name, and the control buttons (play-pause, stop, next and previous song), but after an update to android 6, this information is not available at the block page.

Anyone knows why?