If you look at the specs 24.301 , it clearly lists down the abnormal cases for each protocol procedure at EMM & ESM.
Here is the verbatim spec wording from R9 24.301 spec , page 57.
If the network receives a DETACH REQUEST message before the ongoing GUTI reallocation procedure has been completed, the network shall abort the GUTI reallocation procedure and shall progress the detach procedure.