Been having a very specific but tiresome issue with swipe to queue while filtering my own playlists. It seems that when I pull up a spotify playlist (e.g. Discover Weekly, Release Radar, etc.) swipe to queue works fine. However when I open my own created playlist and enter a text filter, I cannot queue the songs that come up under that filter.
I’ve confirmed this also happen's on my friend’s iPhone running iOS 12.1.4 and 12.2 as well. It hasn’t worked for a couple iOS releases.