Preset JSON scheme allows missing BinaryDir/generator for previous versions of the scheme

The following CMakePresets.json file validates against the current schema.json file:

{
  "version": 1,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 19,
    "patch": 0
  },
  "configurePresets": [
    {
      "name": "somePreset",
      "cacheVariables": {
        "HELLO_WORLD": "ON"
      }
    }
  ]
}

But using it with e.g. cmake 3.20.5 fails because binaryDir and generator are missing from the somePreset preset.

The actual cmake error is:

CMake Error: Could not read presets from /home/maarten/project: Invalid preset

Imho, this error is very non-descriptive.

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