IEC 60870-5-101/104: Wireshark doesn't decode File Transfer ASDU

Summary

Wireshark doesn't decode all the bytes for the following ASDU:

F_FR_NA_1 - 120 - File ready
F_SR_NA_1 - 121 - Section ready
F_SC_NA_1 - 122 - Call directory - select file - call file - call section
F_LS_NA_1 - 123 - Last section - last segment
F_AF_NA_1 - 124 - Ack file - ack section

Sample capture file

F_AF_NA_1.pcapng

F_SC_NA_1.pcapng

F_FR_NA_1.pcapng

Steps to reproduce

1. Run a Slave device with protocol IEC-104
2. Run a Master device with protocol IEC-104
3. Request a File (upload or download)

What is the current bug behavior?

IEC 60870-5-101/104 ASDU: ASDU=12346 F_FR_NA_1 File    IOA=10000 'file ready'
    TypeId: F_FR_NA_1 (120)
    0... .... = SQ: False
    .000 0001 = NumIx: 1
    ..00 1101 = CauseTx: File (13)
    .0.. .... = Negative: False
    0... .... = Test: False
    OA: 0
    Addr: 12346
    IOA: 10000
    Raw Data: 0c005db60000

What is the expected correct behavior?

IEC 60870-5-101/104 ASDU: ASDU=12346 F_FR_NA_1 File    IOA=10000 'file ready'
    TypeId: F_FR_NA_1 (120)
    0... .... = SQ: False
    .000 0001 = NumIx: 1
    ..00 1101 = CauseTx: File (13)
    .0.. .... = Negative: False
    0... .... = Test: False
    OA: 0
    Addr: 12346
    IOA: 10000
    Raw Data: 0c005db60000

Decode correctly "Raw Data":
File number: 0x0c -> 12
File size: 0x005db6 -> 46685 bytes
RFQ: 
0x00 -> OK
0x00 -> False

Build information

Version 4.6.2 (v4.6.2-0-g24d5e2b5a3dc).

Compile-time info:
 Bit width: 64-bit
  Compiler: Clang 14.0.3 (clang-1403.0.22.14.1)
      GLib: 2.84.1
 With:
  +automatic updates          +nghttp2 1.65.0
  +brotli                     +nghttp3 1.9.0
  +Gcrypt 1.11.2              +PCRE2 10.45 2025-02-05
  +GnuTLS 3.8.11 and PKCS#11  +Qt 6.9.3
  +Kerberos (MIT)             +QtMultimedia
  +libpcap                    +Snappy 1.2.2
  +libsmi 0.4.8               +Sparkle
  +libxml2 2.14.2             +xxhash 0.8.3
  +Lua 5.4.7                  +zlib 1.2.11
  +LZ4 1.10.0                 +zlib-ng 2.2.4
  +MaxMind                    +Zstandard 1.5.7
  +Minizip-ng 4.0.10
 Without:
  -POSIX capabilities

Runtime info:
      OS: macOS 26.1, build 25B78 (Darwin 25.1.0)
     CPU: Apple M1
  Memory: 8192 MB of physical memory
    GLib: 2.84.1
  Locale: LC_TYPE=UTF-8
 Plugins: supported, 23 loaded
 With:
  +brotli 1.2.0            +light display mode      +Qt 6.9.3
  +c-ares 1.34.5           +LZ4 1.10.0              +xxhash 803
  +Gcrypt 1.11.2           +nghttp2 1.65.0          +zlib 1.2.12
  +GnuTLS 3.8.11           +nghttp3 1.9.0           +Zstandard 1.5.7
  +libpcap 1.10.1          +PCRE2 10.45 2025-02-05
  +libsmi 0.4.8            +QPA plugin "cocoa"
 Without:
  -HiDPI