This is not a bug. You are changing the package name so the original full name of the custom view doesn't exist. It should still work after the change (though there will be a warning in the logs).
Are you using a device with 0.75 density ?
If yes, change in the class code this line bmp.InitializeMutable(1dip, 1dip)
to this one bmp.InitializeMutable(1, 1)
or to this one bmp.InitializeMutable(2dip, 2dip)