Regression: 2022-08-08 Microsoft.Automation/automationAccounts/runbooks has incorrect validation for "name" property

[StephenWeatherford]

This was not a problem before 2022-08-08.

The following template gives an error with the "name" property of Microsoft.Automation/automationAccounts/runbooks:

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "resources": [
        {
            "name": "parent/automationRunbook1",
            "type": "Microsoft.Automation/automationAccounts/runbooks",
            "apiVersion": "2022-08-08",
            "location": "[resourceGroup().location]",
            "tags": {},
            "dependsOn": [
                "[resourceId('Microsoft.Automation/automationAccounts', 'automationAccount1')]"
            ],
            "properties": {
                "logVerbose": true,
                "logProgress": true,
                "runbookType": "Script",
                "publishContentLink": {
                    "uri": "uri",
                    "version": "1.0.0.0"
                },
                "description": "description"
            }
        }
    ]
}

Error:

Value must match the regular expression ^[a-zA-Z][a-zA-Z-_0-9]*$

EXPECTED: This error is incorrect because the name needs two segments. It should pass.
If you remove "parent" from the name, you instead get an error about the number of name segments.