T46G Tansfer to Prefix+BLF

I had asked this question on 3CX website as well.
So i have a customer who wants a Xfer VM button on there phones.
After doing all research i found there is a Prefix option for a DSSkey on the YeaLink phones.
I programmed a PreFix key as *4
If i press Prefix + BLF i go to the BLF extensions voicemail as expected....

However if i press Transfer + Prefix + BLF the caller gets transferred to *4 only not to the voicemail of the BLF extension.

Since there is 2 different results here it would almost appear as though it is a bug. We would like to see the same function of being able to press transfer + Prefix + BLF.

I had submitted the question to support and they said to just press Transfer + Prefix + dial extension. The issue with that is when we have a receptionist with a couple EXT units. She does not know 100+ extension numbers she knows where there buttons are....

Has anyone else ran into this or have a work around?
Yealink please look at and fix?