Hi,
I'm using Sierra 10.12.6.
The issue is not directly into Mouse.prefPane but into the assets that it does uses.
The video that does explain gesture is the problem (i'm using NVIDIA Web Driver), you can access back to the Magic Mouse preferences panel if you rename MagicMouse.mov into /System/Library/Assets/com_apple_MobileAsset_prefpanes_TrackpadMouseVideos/8d8c589221217f59c640073a8a348ef41934be08.asset/AssetData/ folder.
So, this command do the trick :
Code:
sudo mv /System/Library/Assets/com_apple_MobileAsset_prefpanes_TrackpadMouseVideos/8d8c589221217f59c640073a8a348ef41934be08.asset/AssetData/MagicMouse.mov /System/Library/Assets/com_apple_MobileAsset_prefpanes_TrackpadMouseVideos/8d8c589221217f59c640073a8a348ef41934be08.asset/AssetData/MagicMouse-fix.mov
Regards,