Type of ternary conditional with anonymous classes is computed incorrectly

[MatmaRex]

The following code:

<?php

class Foo {
    function test() { echo 'first'; }
}
class Foo2 extends Foo {
    function test() { echo 'second'; }
}

$a = rand() % 2 ?
    new class() extends Foo {} :
    new class() extends Foo2 {};

'@phan-debug-var $a';

$a->test();

(demo)

Results in the following errors being reported:

input:4: PhanUnreferencedPublicMethod Possibly zero references to public method \Foo::test()
input:10: PhanDebugAnnotation @phan-debug-var requested for variable $a - it has union type \anonymous_class_b2cc6026(real=object)
input:16: PhanUndeclaredClassMethod Call to method test from undeclared class \anonymous_class_b2cc6026

I would expect no errors, as $a is always a subclass of Foo.

The errors do not occur when using an if() statement instead of ternary, or when not using anonymous classes:

if ( rand() % 2 ) {
    $a = new class() extends Foo {};
} else {
    $a = new class() extends Foo2 {};
}

(demo)

$a = rand() % 2 ?
    new Foo() :
    new Foo2();

(demo)

(tested at https://phan.github.io/demo/ – Phan 5.4.1)