I have a script that fetches a certain record, if it exists, and modifies its properties before updating it in the database using replace_item or upsert_item. If I fetch the entire record, change the properties and use that record as both the item and body, it works properly.
But, if I decide I to just fetch the ID of the document (to save on RU), put the id into a new object with the adequate properties, then update using the id and new document, the document gets deleted inexplicably.

The problematic variant of the code can be found below:

dbList = list(dbContainer.query_items(
    query="SELECT c.id FROM c WHERE c.something = @something",
    parameters=[
        dict(name='@something', value=whatever)
    ],
    enable_cross_partition_query=True
    ))

    if dbList:
    # Update the item if it exists, considering we must have only one
        record = dbList[0]
        record['property'] = newProperty
        try:
            container.replace_item(item=record['id'], body=record)
        except exceptions.CosmosHttpResponseError as e:
            print(f"Failed to update record. Details: {e.message}")

I tried using upsert_item instead of replace_item but I get the same outcome. Selecting by ID and setting item=record gives me a KeyError.