HTTP2 dissector reports an assertion error on large data frames

Summary

When analyzing gRPC traffic with large request messages, I see HTTP2 dissector assertion failures instead of properly dissected HTTP2 frames.

Steps to reproduce

Capture the traffic from making gRPC requests with large messages. Request sizes of 200KB or greater consistently trigger the error.

What is the current bug behavior?

Wireshark outputs the following in the dissection:

[Dissector bug, protocol HTTP2: C:\gitlab-builds\builds\-fyeYoMP\0\wireshark\wireshark\epan\dissectors\packet-http2.c:2768: failed assertion "!((pinfo)->fd->visited) && datalen == length"]

What is the expected correct behavior?

The dissection shows an HTTP2 data frame.

Sample capture file

In both of these files, in Preferences -> Protocol -> HTTP2, the port needs to be set to 44363.

failure.pcap captures a 200KB request and demonstrates the error.

success.pcap captures a 20KB request and demonstrates the success path.

Build information

3.4.9 (v3.4.9-0-g365e236f5efe)

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, with nghttp2 1.39.2, with brotli, with LZ4, with Zstandard, with
Snappy, with libxml2 2.9.9, with QtMultimedia, with automatic updates using
WinSparkle 0.5.7, with AirPcap, with SpeexDSP (using bundled resampler), with
Minizip.

Running on 64-bit Windows 10 (21H1), build 19043, with Intel(R) Core(TM)
i7-7800X CPU @ 3.50GHz (with SSE4.2), with 32469 MB of physical memory, with
locale English_United States.utf8, 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, without AirPcap, binary plugins supported
(21 loaded).

Built using Microsoft Visual Studio 2019 (VC++ 14.29, build 30040).