Bug in Stаtistics→TCP Stream graphs

[Minaev Andrey via Wireshark-dev <wireshark-dev () wireshark org>]

Version 3.4.8 (v3.4.8-0-g3e1ffae201b8)

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Compiled (64-bit) with Qt 5.15.2, with libpcap, with GLib 2.52.3, with zlib 1.2.11, with SMI 0.4.8, with c-ares 1.15.0, 
with Lua 5.2.4, with GnuTLS 3.6.3 and PKCS #11 support, with Gcrypt 1.8.3, with MIT Kerberos, with MaxMind DB resolver, 
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automatic updates using WinSparkle 0.5.7, with AirPcap, with SpeexDSP (using bundled resampler), with Minizip.

Running on 64-bit Windows 10 (1709), build 16299, with Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (with SSE4.2), with 
16247 MB of physical memory, with locale C, with light display mode, without HiDPI, with Npcap version 1.31, based on 
libpcap version 1.10.1-PRE-GIT, with GnuTLS 3.6.3, with Gcrypt 1.8.3, with brotli 1.0.2, with AirPcap 4.1.1 build 1800, 
binary plugins supported (21 loaded). Built using Microsoft Visual Studio 2019 (VC++ 14.29, build 30040).

Hello, I think I found a bug. When you open a traffic dump, the net.cap file, and try to look at the Statistics → TCP 
Stream graphs, the error "Selected packet isnt a TCP segment or is truncated" is displayed. But why a complete tcp 
packet is needed is not clear. For example, the "Round trip time" report is based on the time the packet was sent and 
the ACK received, and this does not require the entire packet. Some networking equipment allows only the packet headers 
to be dumped, without the payload, as shown in the traffic dump in the net.cap file.
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