'VS Code - Configuration Properties - presentation order

Following this question from ~ 3 years ago, and linked Github issues that appear to have been worked on and closed in the 1.63 build onwards, I cannot get my package.json order settings to make any difference to the displayed item order (currently on 1.64.2). Here's my file:

{
    "name": "taxi-for-email-validator",
    "displayName": "Taxi for Email validator",
    "description": "Validate Email Design System syntax",
    "version": "0.0.1",
    "publisher": "SparkPost",
    "repository": {
        "type": "git",
        "url": "https://github.com/tuck1s/taxitest.git"
    },
    "icon": "images/taxiforemail-white-on-blue.png",
    "engines": {
        "vscode": "^1.64.0"
    },
    "categories": [
        "Linters"
    ],
    "activationEvents": [
        "onCommand:taxitest.validateEDS"
    ],
    "main": "./out/extension.js",
    "contributes": {
        "commands": [
            {
                "command": "taxitest.validateEDS",
                "title": "Taxi for Email - validate Email Design System syntax"
            }
        ],
        "configuration": [
            {
                "type": "object",
                "title": "Taxi for Email",
                "properties": {
                    "taxi.uri": {
                        "order": 1,
                        "type": "string",
                        "format": "uri",
                        "default": "https://myaccount.emailcms.net",
                        "description": "Enter your account URI including your account subdomain. You can find this in the browser address bar when you are logged in to your account."
                    },
                    "taxi.apiKey": {
                        "order": 2,
                        "type": "string",
                        "default": "abcdef",
                        "minLength": "1",
                        "description": "Enter an API Key from your account. When you are logged in to your account, create a key under Integrations / API Keys / Add new. Record this value safely."
                    },
                    "taxi.keyId": {
                        "order": 3,
                        "type": "string",
                        "default": "ID_xyzzyabcd",
                        "minLength": "1",
                        "description": "Enter an API Key ID from your account. This is visible as you add a new key. Existing key IDs can be seen under Integrations / API Keys / Edit API Key."
                    },
                    "taxi.showSummary": {
                        "order": 4,
                        "type": "boolean",
                        "default": false,
                        "description": "Enables informational output of lines checked, errors, warnings, and run time"
                    }
                }
            }
        ]
    },
    "scripts": {
        "vscode:prepublish": "npm run compile",
        "compile": "tsc -p ./",
        "watch": "tsc -watch -p ./",
        "pretest": "npm run compile && npm run lint",
        "lint": "eslint src --ext ts",
        "test": "node ./out/test/runTest.js"
    },
    "devDependencies": {
        "@types/glob": "^7.2.0",
        "@types/mocha": "^9.0.0",
        "@types/node": "14.x",
        "@types/vscode": "^1.63.0",
        "@typescript-eslint/eslint-plugin": "^5.9.1",
        "@typescript-eslint/parser": "^5.9.1",
        "@vscode/test-electron": "^2.0.3",
        "eslint": "^8.6.0",
        "glob": "^7.2.0",
        "mocha": "^9.1.3",
        "typescript": "^4.5.4"
    },
    "dependencies": {
        "axios": "^0.25.0",
        "form-data": "^4.0.0"
    }
}

repo link.

it still shows in alphabetic order - see below.

What am I doing wrong? I think I'm following the guidance given here.