HFSSPISImulationSetup returned [None] from Cell

### 🔍 Before submitting the issue

- [x] I have searched among the existing issues
- [x] I am using a Python virtual environment

### 🐞 Description of the bug

When HFSS-PI is simulation setup is created we can't retrieve from Cell class.

``` python

core_setup = CoreHFSSPISimulationSetup.create(edb.active_cell, name)

```

Simulation setup looks ok.

But accessing simulation_setups from cell returns list[None]

### 📝 Steps to reproduce

NA

### 💻 Which operating system are you using?

Windows

### 📀 Which ANSYS version are you using?

_No response_

### 🐍 Which Python version are you using?

3.12

### 📦 Installed packages

```shell
NA
```

Start by reproducing the issue on Windows with Python 3.12 using CoreHFSSPISimulationSetup.create(edb.active_cell, name), then inspect the interaction with cell.simulation_setups. Compare the created HFSS-PI setup with the objects returned from Cell and add a regression test showing that the setup is returned instead of None.

Written by the indexing model from the issue text.