Just performed a fresh 3.8.1 vb install followed by import of phpBB3 board. The user import produced some duplicated users but the vast majority are duplicates with imported_ prefix. I've gone through the forums here quite a bit with search and haven't found the exact same issue, but have tried completely wiping and redoing the import as well as merging users too. I'm at a loss and even tried just deleted the imported_ userid's and of course that just... didn't work. One thing I also noticed is that it shows last activity for some users as 12-31-69.
Here are some screen shots from a forum page and the CP showing some of the imported_ users:
Here are some screen shots from a forum page and the CP showing some of the imported_ users:
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