[jingai]

I too am having this trouble. Originally was testing with just one playlist ("80's") and expanded that name to "Eighty's Hits" thinking that name was too short per the suggestion here. When I ask Alexa to play that playlist, ie. "Alexa, ask kodi to play Eighty's Hits", Alexa responds "playing recently added songs".

If it's playing "recently added songs," that generally means Amazon stole the slot value from us.  You can verify by checking what she actually heard in  the app and what the logs say for the skill wherever you're hosting it.