Empty values in RouterOS v7?

Hi,

I’ve updated my RB4011 from V6.49 to ROS 7 (tested 7.1.5 and 7.2RC5). since that update

/ip ipsec active-peers 
:set packet1 ( [ get [ find where id~"nordvpn" ] tx-bytes ] )

returns an empty value.
in winbox i can see actual rx-/tx-bytes or -packets.

Are there changes in syntax or values i didn’t hear about.

Greetz

Problem is solved with ROS 7.3 beta 40.