ANSWER:
This concept is a form of buying shares in a company or a project that one buys for a certain period of time where he is a partner in loss and profit.
If there is a trusted sharia board that overlooks the dealings of such sukook, investing in it is halal in Sha Allah. It is not بيع العينة because this is totally different than buying a share for a period of time and selling it afterwards according to the price of the market and not according to an agreed price!