In this Video , butlers (board buttons or rules) are removed from the board, when one moves the board from one workspace to another.
I would be really upset when Trello deletes cards or lists from the board in such a situation. But these are still integral parts of a board.
Apparently butlers are not part of the board (any more). But they are part of one workspace and they cannot be transferred among workspaces.
The only way I see is recreating them. I would like to know if somebody has some better workarounds here, or if Trello offers a consistent solution.