You're a junior dev, someone tells you something is needed, you work hard on it. I guess you learn to question your boss as to whether it's really needed, but that sometimes isn't optimal, either.
Either your supervisor is good, and you need to trust them, or they are bad and you are likely SOL. Ultimately an organization who is holding a junior directly responsible for high level project decisions that were made in concert with their supervisor, is a bad organization.
if they match, it's probably on point
if not, its probably not worth it