JSON: mixed type field not flagged as JSON if first is a string

[elpaso]

Also see: qgis/QGIS#51911

{ "type": "FeatureCollection",
  "features": [
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": "astring"}
      },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": 42}
      },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": {"nested": 75}}
      }
    ]
  }

ogrinfo -al -q test_string_first.json

OGRFeature(gh_51911_string_first):0
  prop0 (String) = astring
  POINT (102.0 0.5)

OGRFeature(gh_51911_string_first):1
  prop0 (String) = 42
  POINT (102.0 0.5)

OGRFeature(gh_51911_string_first):2
  prop0 (String) = { "nested": 75 }
  POINT (102.0 0.5)

But, moving the string at the second place:

{ "type": "FeatureCollection",
  "features": [
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": 42}
      },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": "astring"}
      },
    { "type": "Feature",
      "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
      "properties": {"prop0": {"nested": 75}}
      }
    ]
  }

ogrinfo -al -q test_string_second.json

Layer name: gh_51911
OGRFeature(gh_51911):0
  prop0 (String(JSON)) = 42
  POINT (102.0 0.5)

OGRFeature(gh_51911):1
  prop0 (String(JSON)) = astring
  POINT (102.0 0.5)

OGRFeature(gh_51911):2
  prop0 (String(JSON)) = { "nested": 75 }
  POINT (102.0 0.5)