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Refer to the Wireshark 3.6.0 Released for more information.

The expression “a != b” now always has the same meaning as “!(a == b)”. In particular this means filter expressions with multi-value fields like “ip.addr != 1.1.1.1” will work as expected (the result is the same as typing “ip.src != 1.1.1.1 and ip.dst != 1.1.1.1”). This avoids the contradiction (a == b and a != b) being true.

It is possible to use the syntax “a ~= b” or “a any_ne b” to recover the previous (inconsistent with "==") logic for not equal.