Bug located in create_fieldplot_volume in post_common_3d.py

[hmulhi]

Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

When creating a Q3D fieldplot using create_fieldplot_volume or its sibling methods with default arguments I get the following error in AEDT message manager:

Upon investigation, I found a private method _check_intrinsics that returns a default intrinsics dictionary {'Freq': 'All', 'Phase': '0deg'} which apparently can't be processed by downstream functions.

The error disappears and plots are created well when I specify intrinsics ..

Steps To Reproduce

Which Operating System are you using?

Windows

Which Python version are you using?

3.11

Installed packages

annotated-types==0.7.0
ansys-api-edb==0.2.2
ansys-edb-core==0.2.6
ansys-pythonnet==3.1.0rc6
ansys-tools-common==0.4.4
asgiref==3.11.1
attrs==25.4.0
certifi==2026.2.25
cffi==2.0.0
cfgv==3.5.0
charset-normalizer==3.4.4
click==8.3.1
clr_loader==0.2.10
colorama==0.4.6
contourpy==1.3.3
cycler==0.12.1
defusedxml==0.7.1
distlib==0.4.0
Django==5.2.11
ezdxf==1.4.3
filelock==3.24.3
fonttools==4.61.1
grpcio==1.76.0
identify==2.6.16
idna==3.11
jsonschema==4.26.0
jsonschema-specifications==2025.9.1
kiwisolver==1.4.9
loguru==0.7.3
matplotlib==3.10.0
nodeenv==1.10.0
numpy==2.2.6
packaging==26.0
pandas==2.3.3
pillow==12.1.1
platformdirs==4.9.2
pre_commit==4.5.1
protobuf==6.33.5
psutil==7.2.2
pyaedt==0.24.0
pycparser==3.0
pydantic==2.12.5
pydantic_core==2.41.5
pyedb==0.69.0
pyparsing==3.3.2
python-dateutil==2.9.0.post0
python-dotenv==1.2.1
pytz==2025.2
pywin32==311
PyYAML==6.0.3
referencing==0.37.0
requests==2.32.5
rpds-py==0.30.0
rtree==1.4.1
scikit-rf==1.10.0
scipy==1.17.1
scooby==0.11.0
shapely==2.1.2
six==1.17.0
sqlparse==0.5.5
toml==0.10.2
tomli_w==1.2.0
typing-inspection==0.4.2
typing_extensions==4.15.0
tzdata==2025.3
urllib3==2.6.3
virtualenv==20.39.0
win32_setctime==1.2.0
xmltodict==1.0.4