Port filtering Excluding one port ( tcp.DstPort != 1234 ) is not working

[dsamal]

I created a filtering rule to drop all the traffic on all ports except for destination port 1234 as " tcp.DstPort != 1234 "

the filtering rule works, as it shows the green dot and says it's filtering however I see it still blocks port 808 as well .. is this a known issue? So please fix this else please add this as a new feature. thanks!