Sometime in the Fall I found that I was unable to play songs marked as explicit on my google play devices.  Early on it would say that filtering was on, but now it will go on like it's going to play the song, and then say, "I can't play that specific song; so here's a similar mix on Google Play Music".  I turned off content filters, and turned off YouTube Restricted Mode, but the issue still persists.  I also noticed that if I'm listening to an album, google home will simply skip the explicit songs.  If I try to play these songs on the speakers via chromecast from my phone, they work fine.