Cannot publish Entry - "Validation error" - non existing locale?

While trying to publish an entry, the error returned refers to a path that has en-US in it, while I don’t have it activated, I only have one that’s the default: hu.

Is it expected that I’d get en-US in the error report even though it’s not present in the space, or could that be the reason I’m getting the error?

This is the node I have at the given path under the default language in the space (hu, NOT en-US):

{
  "type": "break",
  "position": {
    "start": {
      "line": 1,
      "column": 22,
      "offset": 21
    },
    "end": {
      "line": 2,
      "column": 1,
      "offset": 24
    },
    "indent": [
      1
    ]
  }
}

This is the relevant part of the error report:

"details": "Value must be one of expected values",
"path": [
  "fields",
  "body",
  "en-US",
  "content",
  0,
  "content",
  1
],
"value": {
  "data": {},
  "content": []
},
"expected": [
  {
    "$ref": "#/definitions/Inline"
  },
  {
    "$ref": "#/definitions/Text"
  }
]