Uh, so I did the 110 trial thing on a character. Completed it and took the gryphon to Stormwind (leaving the auto-queue for Battle of Lordaeron)
Abandoned the quest, then re-accepted it at the Stormwind Docks and skipped the scenario. And then...just got to keep playing and started the BFA quest line. Now I'm in Kul Tiras leveling up. Doesn't seem to be restricted in any way. At the login screen it still says "Apply Boost to Unlock" for the character.
What's the chances the character gets deleted or reset?
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