Please tell us some basic information before asking for help:
Model Name: Rog 3
Firmware Version: 2008.78
Rooted or not: no
Frequency of Occurrence: always
APP Name & APP Version (If your issue relates to the app): Screen Lock + Spotify
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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There is a bug with lockscreen when you enable "show music cover picture". The lock screen becomes a gray screen with no wallpaper. This can be tested by playing something on spotify.
