@JeremyECrawford Thanks for your time. RAW Detect Magic doesn't reveal the magic of a visible object placed inside a sealed bottle, RAI ?

— TadenRif (@TadenRif) November 29, 2016

Detect magic can penetrate most barriers. Its second paragraph provides details. #DnD https://t.co/OF43G8KR0O

— Jeremy Crawford (@JeremyECrawford) November 30, 2016

@TadenRifOK. So cover rules do not prevail when casting Counterspell or Dispel Magic on a target beyond a transparent wall, too ? Look at the text of those spells. They lack the paragraph that detect magic has about barrier penetration.

— Jeremy Crawford (@JeremyECrawford) November 30, 2016