Iptables string matching not working in newest Distro version

@dcitelecom wrote:

We recently upgraded to distro version 10.13.66-16 Released 09-14-16 and after the reboot Iptables string matching is no longer working as it should.

e.g. The string below used to work and now it doesn't
-A INPUT -p udp --dport 5060 -m string --string "INVITE sip:" --algo bm -j ACCEPT

However this works
-A INPUT -p udp --dport 5060 -m string --string "INVITE" --algo bm -j ACCEPT

I see it's running iptables v1.4.7
Anyone aware of any changes in the iptables version used in the distro or anything else that could affect string matching in iptables?

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