RedundantCondition on nullable enum is a false positive

[Jean85]

If I have a nullable backed enum, and I try to concatenate it with a null coalesce, I get two errors, but those are false positives.
It works if I suppress it with a nullsafe accessor, but that's redundant (see https://3v4l.org/ZZpui)

https://psalm.dev/r/6304b00b6f

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/6304b00b6f

<?php

enum Something: string {
    case A = 'A';
    case B = 'B';
}

function test(?Something $foo): void {
    echo $foo?->value ?? 'nullsafe'; // nullsafe accessor is not needed!
    echo $foo->value ?? 'nullsafe'; // false positive
}

Psalm output (using commit 986ef8d):

ERROR: RedundantCondition - 10:10 - Type 'A'|'B' for $foo->value is always isset

ERROR: TypeDoesNotContainType - 10:25 - Cannot resolve types for $foo->value with type string and !isset assertion