Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,182
Ambassador free weekend stay bookings don't show up online as a rate of 0 for the second night.
If you can tolerate the risk of paying the full rack rate for the second night, there's no harm in seeing if this glitch sneaks through.
But otherwise it's best to assume that something will go wrong since the rules are clearly against you.