Magic Mouse issue with 27.0 updated

Hi there

Please try this to see if you can fix the issue

Update or Disable Macro Tools

• If you use Mac Mouse Fix or a similar third-party macro/gesture app, check for the latest developer "master" or beta build that addresses macOS 27 gesture handling. 
• Temporarily quit or uninstall the macro application completely, then restart your Mac to see if the Magic Mouse starts responding normally.

2. Check and Update Mouse Firmware

• Connect your Magic Mouse to your Mac using its Lightning/USB-C cable.
• Make sure your Mac has Install system data and security updates enabled under System Settings > General > Software Update.
• Leave the mouse connected and switched on overnight while the Mac is awake so the accessory firmware can update past version 1.9.2. 

3. Forget and Re-Pair the Mouse

• Go to System Settings > Bluetooth.
• Click the Info (i) button next to your Magic Mouse and select Forget This Device.
• Turn the physical power switch on the bottom of the mouse off, wait a few seconds, and turn it back on.
• Reconnect the mouse directly with the charging/pairing cable for about a minute before disconnecting it to test wirelessly.