This issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.0.1. A person with access to a host Mac may be able to bypass the Login Window in Remote Desktop for a locked instance of macOS.
[
{
"product": "macOS",
"vendor": "Apple",
"versions": [
{
"lessThan": "12.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]