[Bug]: Half of the items are being lost in loops if the final output is not passed over to the next iteration

### What happened?

Here is a simple graph that loads a dataset and gets one item from it in each iteration

After all iterations, the subgraph call has 54 outputs, while the next node after it has only 27.



If we check the execution iteration 2, it is clear that the input of text node does not match the output of the subgraph.
Connecting the text output to the loop data property and adding a break node temporary fixes this issue

### What was the expected functionality?

Input values should match the output values of the nodes they're connected to, when data is transferred between nodes

### Describe your environment

MacOS sonoma 14.4.1, Rivet version: app-v1.8.0

### Relevant log output

_No response_

### Relevant screenshots

_No response_

### Code of Conduct

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