Play Protect warns about invisible app

Infected operating system
Android 11
Infected device
Unimax U696CL
Infected device issues
Play Protect repeatedly warns me that a preinstalled app (Set Wallpaper) is unsafe and that I should uninstall it, but tapping the notification just shows Play Store, and the app can't be found in Settings.
Steps taken to remove the infection
Tapping Play Protect warning, which leads only to Play Store homepage

South Park

Level 9
Thread author
Verified
Well-known
Jun 23, 2018
435
2,374
767
USA
github.com
Google Play Protect repeatedly warns me that a preinstalled app (Set Wallpaper) is unsafe and that I should uninstall it, but tapping the notification just shows Play Store, and the app can't be found in Settings. I suspect that it's been restricted by Play Protect but would like to confirm that.

Third-party AV is a no-go for me, since using Sophos-X on the same brand of phone (but different model) to attempt removal of Hidden Ads malware bricked the phone.

Factory-new Unimax U696CL, Android 11, June-05-2023 patch level. Unimax is notorious for preinstalled malware, but it's what Lifeline sends its customers. (It's actually a better phone than the dreadful Moxee they sent previously, which only worked for calls if speaker mode was enabled.)

Thanks.