<frame not available> when debugging pydantic

I use the pydantic library. No breakpoints within the pydantic code get hit and when an exception is thrown inside pydantic code, I only see <frame not available>.

I can reproduce it with the following minimal setup:

1. create a venv for a project and install pydantic into it: 

python -m venv venv
source venv/bin/activate
pip install pydantic

2. create a super-simple script with a pydantic model:

#simple.py
from pydantic import BaseModel
class MonthYear(BaseModel):
    year: int
    month: int

MonthYear.parse_obj('test')

Running this raises an Exception inside pydantic code and the execution halts at the exception breakpoint, but I only see this:

The console output also doesn't "realize" that the sources are in fact available (no clickable link for the pydantic/main.py):

However, the sources are available, but also breakpoints inside them are not hit:

The python interpreter is configured correctly and also 'sees' the installed pydantic library:

I am very grateful for any hints on how to fix this issue :)

BR Felix