Possible Notion API bug - Can't create Database Page with URL data - rest

Question

I have a Notion database that I'm trying to write to via the API.
I can write to text fields, but when I try to write to a URL field, I receive the following error:
{
"object": "error",
"status": 400,
"code": "validation_error",
"message": "body failed validation. Fix one:\nbody.properties.O?HT.id should be defined, instead was `undefined`.\nbody.properties.O?HT.name should be defined, instead was `undefined`.\nbody.properties.O?HT.start should be defined, instead was `undefined`."
}
This is the API description of that field:
"LinkedIn": {
"id": "O%3FHT",
"name": "LinkedIn",
"type": "url",
"url": {}
},
This is the body of the API POST request that's failing:
{
"parent": {
"database_id": "f016c02beeff4a34bf298ceb8a8a079f"
},
"properties": {
"title": [
{
"text": {
"content": "Mark Zuckerberg"
}
}
],
"%3DCzE": [
{
"text": {
"content": "CEO"
}
}
],
"HihI": [
{
"text": {
"content": "Facebook"
}
}
],
"JC%3BS": [
{
"text": {
"content": "Menlo Park, CA"
}
}
],
"O%3FHT": {
"url": "https://www.linkedin.com/in/mark-zuckerberg/"
},
"wS%7BN": {
"url": "https://www.linkedin.com/company/facebook/mycompany/verification/"
}
}
}
I'm basing the body contents on the Postman docs provided by Notion: https://www.postman.com/notionhq/workspace/notion-s-api-workspace/documentation/15568543-d990f9b7-98d3-47d3-9131-4866ab9c6df2