App Store app icon is duplicated in Launchpad

Somehow, Apple's App Store app icons are duplicated in the Launchpad on my MacBook Pro running macOS 11.5 (Big Sur). Since this is a system-level application, I cannot delete one of these redundant icons. I tried the strategies that I found on the Internet, i.e., 1. Remove ~/Library/Application Support/Dock/*.db 2. Run defaults write com.apple.dock ResetLaunchPad -bool true 3. Run killall Dock 4. Restart the system But these duplicated icons are still in Launchpad after reboot. I am wondering how to remove one of them?