A double-faced card put onto the battlefield from a zone other than the stack enters the battlefield with its front face up by default.
November 18, 2022 · The Brothers’ War
When a transforming double-faced permanent transforms or converts, it doesn’t become a new object. Any effects that applied to that permanent will continue to apply to it.
July 23, 2021 · Adventures in the Forgotten Realms
When a transforming double-faced permanent transforms, it doesn’t become a new object. Any effects that applied to that permanent will continue to apply to it after it transforms.