At the beginning, this was happening. Despite our best efforts, people were being double-paid. We now have a much more streamlined process where this is not happening. People are not receiving any double payments. We are not penalizing anybody if they did. We are working with them to remedy the situation, and CRA and Service Canada are working in lockstep to ensure this isn't happening anymore.
On May 11th, 2020. See this statement in context.