5E's Impenetrable Darkness syndrome all over again! This happened during 4E early days during first PHB release for those who remember and still happen here. As written, when you are in darkness, you are blinded and cannot see any remote lit area and people within, which is a problem RAW. Also any obscured area by darkness block vision which makes you not see through them. That is okay for magical darkness, but natural darkness should not act that way.
Not many will surly run it that way, but it should probably be updated at some point like 4E did, for consistency reasons.
BR65 Heavily Obscured: A heavily obscured area—such as darkness, opaque fog, or dense foliage—blocks vision entirely. A creature in a heavily obscured area effectively suffers from the blinded condition (see the appendix).