TCP stream rate miscalculation

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I got GTP-U encapsulated traffic and total rate of outer IPv4 stream in conversation statistics is correct. But TCP statistics is wrong, probably the reason is that the data is under TLS and Wireshark is unable to include payload in calculation. Reassembling TLS is enabled in Preference menu, but I don't have decryption keys. And don't need, i just need to learn correct TCP rate in mbits.