RTCSession `ended` event issue when referring to an on hold RTCSession

[PeteAUK]

I've come across what I believe is an issue when dealing with referring with a call that is on hold. To explain:

I establish an RTCSession to phone A
I place this on hold
I establish a second RTCSession to phone B
I use a refer() action on phone A's RTCSession, populating the replaces optional parameter

Phone B's RTCSession correctly emits an ended (Terminated) event shortly after the referral completes. Phone A waits for exactly 60 seconds before emitting it's ended event. This isn't emitted because there's been a termination, but instead because it's timed out and no longer exists.

If I unhold phone A's RTCSession prior to calling the refer action, then both RTCSessions submit an ended event within a millisecond of each other. Equally if I unhold phone A's RTCSession within refers eventHandler: accepted event, the ended events are submitted correctly.

I have tried flipping the refer around (i.e. Phone A.refer(Phone B)), but I still have the same issue, which suggests to me the ended event isn't correctly emitted for held RTCSessions during a refer action. ended events are emitted should an on hold RTCSession be hung up on.