Has anyone elsed noticed that often ITA often shows unbookable fares on one-ways for some airlines? I think this only happens when you have a change of service class somewhere mid-trip.

Currently I am trying to book BAH-BNE and ITA is showing a 360 BHD (approx. USD1000) fare with two segments (BAH-DXB-SIN) in business and the third in economy (SIN-BNE).

I tried to replicate the flight elsewhere but to no avail.

Would be nice....