Repeating paths is not a bug or issue, since it's built as a "randomizer" and you get more tickets than there are paths.
As a gated entry, with tickets being refunded if you exit out, this is not a bug, it is working as intended. The paths are basically class-dependent because of the defenders and nodes, so if you end up on a path you literally can't do because of who you selected, you can always exit the quest without worrying about wasting your ticket.
None of this is a bug, just a poor design by Kabam. If the way it's built allows me to try a few extra times for a path I'd rather have, I'm going to use how the game mode was literally designed and released to us to achieve that.
You will not receive the reward unless you finish the quest, right? So you cannot exploit anything there.. But you can re-jump to explore each path.
I would rather have the Ticket back than Entries being used if you try. That's the worst format.
Oh 100%
Ones where it's consumed on entry infuriate me. They shouldn't have quests like that to begin with.
I will always take 'gate keys refunded' if you back out of the quest.