There is a mutation for creating an item in a board (create_item) and passing the create_labels_if_missing flag, which creates status and dropdown column labels that aren’t present in the destination board.
A similar functionality should be added to the move_item_to_board mutation such that missing labels in the destination board are created. Currently, label information gets lost when the destination board doesn’t have the same labels as the source board and the label is replaced with wrong labels in the destination board.
This new feature would work in a similar way as the one in the create_item mutation and solve the problem of lost label data when moving an item from one board to another.