macOS Big Sur Dock icon size and Launchpad icon size relations

When I increase the size of the Dock icon to over 60, the Launchpad app icon decreases.

defaults write com.apple.dock tilesize -int 60; killall Dock

The Launchpad icons are normal.

defaults write com.apple.dock tilesize -int 62; killall Dock

The Launchpad icons are smaller.

Is this normal??