Ghost messages populate newly joined hashtag group

[Hardbuckle]

When "creating" a hashtag group, upon viewing, the group is loading existing messages from other groups.

[pelgraine]

Which hashtag?

The fact that the channel is populating suggests you've been choosing channels someone has already started using, and now that you've added the hashtag you're able to decrypt and display all the packets your node collected previously relating to that hashtag/channel.