False positive "Coalesce operator ?? is unnecessary" when the last method in the chain has return type null #15134

abstract class Parser {
    protected function parseExpressionChild(bool $value): ?Node {
        return $this->parseNumber($value) // Coalesce operator ?? is unnecessary because the left side is always set and the right side is null.

            ?? $this->parseSpace($value);
    }

    abstract protected function parseNumber(bool $value): ?A;

    protected function parseSpace(bool $value): null {
        if ($value === false) {
            throw new LogicException('Value is not valid.');
        }

        return null;
    }
}