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mishandling the SYN SYN:ACK phase.

If by "mishandling" you mean that there is no full 3-way handshake, then it is logical that there is no iRTT being shown, as Wireshark calculates the iRTT based on the timings in the 3-way handshake. If this is the case, the problem is in the faulty 3-way handshake and the missing iRTT is just a symptom.