i4btrace issue using Wireshark 2.6

[Dario Bozzali <Dario.Bozzali () ifmgroup it>]

Hello,
I'm facing an issue using latest release of Wireshark (I noticed it using 2.6.1 and 2.6.2) trying to dissect i4btrace 
files: files are opened and they are quite recognized as ISDN files (under protocol column), but no ISDN details (i.e. 
Q.931 signaling) are available for dissected packets.
I also tried the sample capture "An I4B (ISDN for BSD) capture file." 
https://wiki.wireshark.org/SampleCaptures?action=AttachFile&do=get&target=i4b.trace, but the result is the same that I 
obtain with my own I4B files.
I tried the oldest stable release 2.4.8 and using that release it works properly. I'm using Wireshark for Windows 10 64 
bit.
Am I missing some setting that has been changed among releases?
Thank you in advance and kind regards,
Dario Bozzali

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