It's important to remeber that IX Hispana was always under strength since its near destruction during Boudicca's revolt (Annals 14.29) so that by the campaigns of Agricola, it numbered only 1000 under Lucius Roscius Aelianus (CIL 14, 3612). Because of this it almost saw destruction once again in Caledonia during 83/84AD. Little more is known until it's construction of a gate way at Eboracum fortress which is dated to 107-108AD (RIB 1,665). then due to the legions absence during the construction of Hadrians Wall some consider it to not even be in Britain. Some evidence even tells us that a legate of the legion in 121AD was buried in 127AD in Petra after serving as governor of Arabia Petraea (CIL 3,87). It seems likely that the legion was not destroyed in Britain, but possibly in the Second Jewish Revolt or one of the Armenian Campaigns.

Edit* Tiles found in Noviomagnus on the Rhine suggest the legion was transferred to Germania around 121AD before being moved to the East.

Lurking dilettante wannabe here ( enough with the caveats) Is this thread about the Lost Eagles of Varus or is that another Roman Legion mystery?