I experienced missing simulators in VS Code after XCode updated. Fixed it by doing the following:

1. Install latest XCode

2. Install XCode Command Line Tools (same version as xcode)

3. Install the latest Simulators

4. Reboot

5. Open XCode, go to Settings -> Locations and make sure the Command Lines Tools is set to the latest version

6. install the workloads again:

   sudo dotnet workload install maui

   sudo dotnet workload install maui-ios

   sudo dotnet workload install maui-android