If you do a node swap, the node_id fields in the ezm_block table are not updated. This means that the eZ Flow cronjob will not properly clear the cache for (see eZFlowOperations::update) for the new node when content is updated (specifically when block items need to be rotated), and instead clears the cache for the old node.

Steps to reproduce

1. Create a new frontpage object with 1 manual block. Add a few items to that block.
2. Create a second frontpage object with 1 manual block. Add a few items to that block.
3. Swap the two frontpage object/nodes.
4. Update only one frontpage (adding a new item to the block) and note how only the cache for the other frontpage gets cleared