interface vs type in typing React children

The following snippet doesn't pass the type checking: https://flow.org/try/#0JYWwDg9gTgLgBAKjgQwM5wEoFNkGN4BmUEIcA5FDvmQNwBQdwAdjFlAXlnAArFjoBvOnDi4AFsAA2AE0pMAXJiowAdAGEJMuQEEoUZAE8APNjyqAopKwgsLIwgB8DgDR0AvvTq5JadABUsVHgsAA9WJml0U3x1EkgmWxgjXgh+BzghETlpNgAKAEoM4RE4ShgAVygmOFzikrgjaWAANwcBGAlUFTA+LvEpWVs3IwB6Jta6uHz6ETd3BgYjAKCHYqNUMGQmBwIICFGNrdWRdc3t3f2Rw+26UeWYByA

However if we use `type Props` instead, it works perfectly fine:
https://flow.org/try/#0JYWwDg9gTgLgBAKjgQwM5wEoFNkGN4BmUEIcA5FDvmQNwBQdMAnmFnAArFjoC8cA3nThxcAC2AAbACaUAdgC5MVGADoAwuOlyAglCjImAHmx5VAUQlYQWWTEMIAfA4A0dAL706uCWnQAVLFR4LAAPGBspdBN8dRJIWRs7TghuBwEhODkpLCgACgBKdOFhShgAVyhZOFyM4rhDKWAANwd+GHFUFTAuTrFJGRs3QwB6RpbauHz6YTd3BgZDAKCHDMNUMGRZBwIICBH1zZXhNY2tnb3hg626EaWYByA

Is this indented? If yes, what is the reason behind?