Photon bolt on unity 5.5 never uses nat punchthrough

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Hi, devs may want to know this,
this is what I did:
-downloaded 5.5 and 5.6 photon bolt branches on unity 5.5 and 5.6,
-I used the example codes of photon bolt (the new one) in both builds (supplied app id from control panel on website)
-I tested both builds (clients and servers) on multiple networks with and without routers
I always get the same thing:
- on 5.6 bolt uses nat punch almost everytime and if it fails it uses relay (correct behaviour)
- on 5.5 it never made direct connection with nat punch, even when zeus is connected, always relay
Other things work correctly network game logic etc.
Anyone got it working correctly on 5.5?
Cheers