Songs added to collaborative playlist get immediately deleted if added from Carplay

I have a collaborative playlist that I would like songs added on the fly while driving using Apple Music on my Carplay.

So I tell Siri 'Siri, add this song to the Friends playlist'

She replies it's done. But it's not. Most of the times the song is not added. Then I tried to do so whilst having the playlist visible on my phone and you know what? I see the song being added then it disappears. This happens 9 times out of 10.

Is this yet an another annoying bug in Apple Music or it is just me?

Another bug I found out is that if I ask Siri to add the song to a playlist that does not exist, it wars me such a playlist is not in my library and asks me if I want to create it. I say so, and she replies 'ok, I created it' - but you guess what? it is not created.

I also found out that I can not edit the playlist on Apple Music for MacOS - is the collaborative playlist feature only available on iOS?

Siri and Apple Music are so buggy!!!