What you were expecting to happen, and what actually happened:
Both I + a guildmate pulled Queen Aurora when buying tiers from the world event shop. Expected to see an announcement in the guild chat: “USER has found a Mythic Troop: Queen Aurora”. Did not; no announcement for either of us.
How often does this happen? When did it begin happening?
Twice yesterday. Don’t know before then; can’t remember ever pulling a mythic from a shop tier buy before.
it’s been a thing for at least 3 years now… not sure when it was added to “known issues”, but I got at least 2 mythics from events shop tiers during my gameplay and never had it pop up on world/guild channel