This is in patch 5.22
Thresh can no longer buy 
Runaan's Hurricane, but also does not receive the AoE effects from the 
Titanic Hydra. MFW I expected to get a cone of fun stuff behind my target, and nothing happened...
Thresh Titanic HydraI've gotten this issue every time so far.
Big Lincoln3 votesmelee only
thresh - ranged
OperationDEEZ12 votes/thread
Nilius Rex1 votesI understand that Thresh is ranged, but in the new patch (5.22), you can't buy Runaan's Hurricane with Thresh anymore because it says ranged only. I could however buy the Hydra, but it didn't give me the effect. That's a bug either with the Hurricane not being available being a bug, or with the Hydra not giving the passive.
Archon X1 votesprobably because both Titanic and Runaan's are troll items on him, even if he could use them.
Nilius Rex1 votesHe used to be able to use Runaan's, but now he can't buy it anymore. He can buy the Hydra tho, but it doesn't give the passive, which is not okay.
Natsurr1 votesYup, Thresh's ranged.