False positive regarding EXTENSION_FOUND_BUT_NOT_USED in child tileset

[bjornblissing]

Validating tileset tileset.json
Validation result:
{
  "date": "2024-03-21T12:42:19.064Z",
  "numErrors": 1,
  "numWarnings": 5,
  "numInfos": 0,
  "issues": [
    {
      "type": "EXTERNAL_TILESET_VALIDATION_ERROR",
      "path": "0/0/0.json",
      "message": "0/0/0.json caused validation errors",
      "severity": "ERROR",
      "causes": [
        {
          "type": "EXTENSION_FOUND_BUT_NOT_USED",
          "path": "0/0/0.json/extensionsUsed",
          "message": "The extension 'MAXAR_extent' was found, but not declared in 'extensionsUsed'",
          "severity": "ERROR"
        },
...
}

The scenario here is that we have a tileset.json that has an MAXAR_extent extension and also included in it's extensionsUsed.
tileset.json then references 0/0/0.json as the first tile, this JSON does not list MAXAR_extent in extensionsUsed since it does not use it.

Our assumption is that extensionsUsed shall list all extensions used by the tileset itself and it's children, but the children does not need to list the parents extensions.

This error is only shown when running on /tileset.json, not /0/0/0.json

[bjornblissing]

Fixed in:
#305