ketcher generate wrong *.ket format while processing reactants and catalysts

wrong number of reactants and catalysts
.ket file from ketcher 2.5
python indigo 1.83

```python
from indigo import Indigo

indigo_ins = Indigo()

r = indigo_ins.loadReactionFromFile(r"D:\reaction.ket")
reactants = r.iterateReactants()

for reactant in reactants:
print(reactant.smiles())
if __name__ == '__main__':
pass
```
Output:
```python
C1CCCCCCC1
CC(=O)[O-]
[Na+]
```
Expected:
```python
C1CCCCCCC1
CC(=O)[O-].[Na+]
```

Start with the reaction.ket example and the Python entry points loadReactionFromFile and iterateReactants. Reproduce the output with Indigo 1.83, then trace how reactants and catalysts are separated; done means the sodium ion remains grouped with the acetate as shown in the expected output.

Written by the indexing model from the issue text.