Are you sure that 'force resume' starts as 'find sources'?

When I choose 'force resume' all it does is try to connect, with whichever source it had before, I assume. After awhile the familiar 'need more sources' appears.

Whenever the actual 'find sources' is offered I get decent download sources.

I would like to know what actually triggers the offering of 'find sources', and if there is a way to make it happen at will.