I’ve found that if I start playing the first track in the playlist and then just quickly hit next to jump to the next track in the playlist until I get all the way through it, the export will work and not freeze up on me. This can be tedious depending on how many songs are in your playlist but the export went pretty quick for me after I did this workaround. I still wish it would just work the way it’s supposed to without having to jump through any hoops though.