bug in create_trace()

### Before submitting the issue

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

### Description of the bug

In gRPC, Parameterization is lost after trace is created by create_trace()

### Steps To Reproduce

```
from pyedb import Edb

edb = Edb(version="2026.1",
# grpc=False
)

edb.stackup.create_symmetric_stackup(2)
edb.add_design_variable(
"x", "1mm"
)
edb.modeler.create_trace(
path_list=[[0,0], ["x", 0]],
width="0.1mm",
layer_name="TOP",
)
edb.save()
print(edb.edbpath)
edb.close()
```

### Which Operating System are you using?

Windows

### Which Python version are you using?

3.7

### Installed packages

ALL

Start at the modeler.create_trace() entry point and reproduce the issue with the provided Python example on Windows. Trace how the parameterized path using design variable x is handled through trace creation and saving; done means the parameterization remains available after the trace is created and the EDB is saved.

Written by the indexing model from the issue text.