[EMBEDDED] ``Model.DeleteParts(geo_part_list)`` giving error

This behavior is seen only in embedding but no issues with batch mode or with Mechanical scripting window.
To replicate this after importing a geomtry

```
part_id_list = [3,7]
geo_part_list = [ExtAPI.DataModel.GeoData.GeoPartById(id) for id in part_id_list]
Model.DeleteParts(geo_part_list)
```
```
CRITICAL - - logging - handle_exception - Uncaught exception
Traceback (most recent call last):
File "C:\Users\dkunhamb\Downloads\K18_Board (1)\K18_Board\pymech.py", line 21, in
Model.DeleteParts(geo_part_list)
System.ArgumentException: Argument must be an `IGeoPart` or collection!
Parameter name: parts
at Ansys.ACT.Automation.Mechanical.Model.DeleteParts(Object parts)
```

Start by reproducing the snippet in pymech.py with the embedded execution path, then compare it with batch mode and the Mechanical scripting window. Investigate the Model.DeleteParts(geo_part_list) entry point and the reported IGeoPart collection exception; done means the same imported parts can be deleted successfully when embedded.

Written by the indexing model from the issue text.