Workflows are associated with projects, not boards (with one exception). If you've changed the workflow status list, you need to reconfigure the board to pick it up, because it doesn't really know what you want from the changes.
If you have a "simplified" workflow, then yes, your workflow is more closely associated with your board, usually with a 1:1 status to column mapping, but depending on your changes, that might not update the columns and you'll need to do the mapping yourself.
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