Xcode-beta fails to start Loadin

First run this command and set it to the path of the beta version:

sudo xcode-select -s <path/to/>Xcode.app

sudo xcode-select -s <path/to/>Xcode.app

Then you will have to agree to the license with this command

sudo xcodebuild -license

sudo xcodebuild -license

That will prompt you to display the license and then type agree to accept it.

Then run this command

xcodebuild -runFirstLaunch

xcodebuild -runFirstLaunch

And now Xcode will open.

I just had this same issue and this fixed it for me on a M3 Max MacBookPro. I hope this helps!