My Note 10+ has also been doing this with Spotify specifically, both after I've fully closed the currently playing song (usually connected to my car via Bluetooth), turned off Bluetooth, closed the app itself, and paused the song playback before doing all of those steps in the first place. I'll open my phone at any given time later and find the same song or another showing in the notification list, showing its playing, but not actively playing aloud from my phone or through any connected external speaker. I went and limited background battery usage in Settings because it's been eating through a fully charged battery in only 3-4 hours, causing me to charge my phone 4 times per day, which then caused playback issues when I was actually using the Spotify app. Uninstalling and reinstalling didn't help. If anyone finds a workaround, let me know please.
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