Problems with Property Hooks

Doing a simple

class ConfigChecker
{
    public FTPInterface $ftpCheckObject {
        get {
            return $this->ftpCheckObject;
        }
        set(FTPInterface $value) {
            $this->ftpCheckObject = $value;
        }
    }
}

causes the following errors:

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FOUND 10 ERRORS AND 2 WARNINGS AFFECTING 4 LINES
--------------------------------------------------------------------------------
 10 | ERROR   | There must not be more than one property declared per statement
 12 | ERROR   | Visibility must be declared on property "$this"
 12 | ERROR   | Scope modifier not specified for member variable "$this"
 14 | WARNING | Code after the RETURN statement on line 12 cannot be executed
 14 | ERROR   | There must not be more than one property declared per statement
 14 | ERROR   | Visibility must be declared on property "$value"
 14 | ERROR   | Scope modifier not specified for member variable "$value"
 15 | WARNING | Code after the RETURN statement on line 12 cannot be executed
 15 | ERROR   | There must not be more than one property declared per statement
 15 | ERROR   | Visibility must be declared on property "$this"
 15 | ERROR   | Scope modifier not specified for member variable "$this"
 15 | ERROR   | Scope modifier not specified for member variable "$value"
--------------------------------------------------------------------------------

Start by running the PHP code sample through the repository's checker and compare the reported diagnostics with the expected handling of property hooks. Trace the parsing and property-validation entry points responsible for the listed errors. Done means the sample no longer produces false property and unreachable-code errors.