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Because the code in 4.0.12 is different from the code in 4.2.1. One or more of one may have a bug (and a fix to a 4.0.12 bug may have introduced a 4.2.1 bug).
Please file an issue on the Wireshark issue list, and attach the raw capture (NOT a screenshot!) to the bug, as a capture file will make it MUCH easier to debug the problem and test a fix for the bug).
Because the code in 4.0.12 is different from the code in 4.2.1. One or more of one may have a bug (and a fix to a 4.0.12 bug may have introduced a 4.2.1 bug).
Please file an issue on the Wireshark issue list, and attach the raw capture (NOT a screenshot!) to the bug, as a capture file will make it MUCH easier to debug the problem and test a fix for the bug).bug.