Adding a new label to an issue board issue should not add a new list
Steps to recreate:
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Go to issues -> boards
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Click an issue card (not the link) to open the right-sidebar panel (quick info)
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Click "Edit" link next to Labels
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At the bottom of "Assign labels", click "Create new label"
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Enter a name and select a color, then click "Create"
A list should only be generated when you add a new label via the new list dropdown. If a user is adding a new label to an issue via the issue board, a new list should not be added.