Can not return to ivr with "t" option

hi:
freepbx would generate some “return” extension when create ivr context. like:

exten => return,1,Set(IVR_CONTEXT=${CONTEXT})
exten => return,n,Set(IVR_CONTEXT${CONTEXT}=${IVR_CONTEXT
${CONTEXT}})
exten => return,n,Goto(ivr-13,s,begin)

but i found if i set the ivr with “t” option, then freepbx won’t generate these return extensions. and the ivr can not be returned from other objects.

In my situation, with Freepbx 2.4, they are generated, almost at the end of the ivr sections.

Like in the following testivr

[ivr-4]
include => ivr-4-custom
include => from-did-direct-ivr
include => app-directory
exten => #,1,dbDel(${BLKVM_OVERRIDE})
exten => #,n,Set(__NODEST=)
exten => #,n,Goto(app-directory,#,1)
exten => h,1,Hangup
exten => s,1,Set(LOOPCOUNT=0)
exten => s,n,Set(__DIR-CONTEXT=default)
exten => s,n,Set(IVR_CONTEXT${CONTEXT}=${IVR_CONTEXT})
exten => s,n,Set(_IVR_CONTEXT=${CONTEXT})
exten => s,n,GotoIf($["${CDR(disposition)}" = “ANSWERED”]?begin)
exten => s,n,Answer
exten => s,n,Wait(1)
exten => s,n(begin),Set(TIMEOUT(digit)=3)
exten => s,n,Set(TIMEOUT(response)=10)
exten => s,n,WaitExten(,)
exten => hang,1,Playback(vm-goodbye)
exten => hang,n,Hangup
exten => 1,1,dbDel(${BLKVM_OVERRIDE})
exten => 1,n,Set(__NODEST=)
exten => 1,n,Goto(from-did-direct,915,1)
exten => 2,1,dbDel(${BLKVM_OVERRIDE})
exten => 2,n,Set(NODEST=)
exten => 2,n,GotoIf($["x${IVR_CONTEXT
${CONTEXT}}" = “x”]?ivr-3,s,1:${IVR_CONTEXT
${CONTEXT}},return,1)
exten => t,1,dbDel(${BLKVM_OVERRIDE})
exten => t,n,Set(NODEST=)
exten => t,n,GotoIf($["x${IVR_CONTEXT
${CONTEXT}}" = “x”]?ivr-3,s,1:${IVR_CONTEXT
${CONTEXT}},return,1)
exten => i,1,Playback(invalid)
exten => i,n,Goto(loop,1)
exten => loop,1,Set(LOOPCOUNT=$[${LOOPCOUNT} + 1])
exten => loop,n,GotoIf($[${LOOPCOUNT} > 2]?hang,1)
exten => loop,n,Goto(ivr-4,s,begin)
exten => return,1,Set(IVR_CONTEXT=${CONTEXT})
exten => return,n,Set(IVR_CONTEXT${CONTEXT}=${IVR_CONTEXT
${CONTEXT}})
exten => return,n,Goto(ivr-4,s,begin)
exten => fax,1,Goto(ext-fax,in_fax,1)

; end of [ivr-4]