Spring Rest Controller Advice Error

This is a minimal reproduction of an error I'm running into with Spring. Issue opened with Spring here: spring-projects/spring-framework#30945

Steps to reproduce

Start the spring application

Navigate to the spring application directory:

cd demo

Start the application:

.\gradlew bootRun

Run the poorly-behaved client

In a separate terminal window, navigate to the client directory

cd api-calls

Create a virtual environment:

python3 -m virtualenv venv

Activate the virtual environment (this may look slightly different on *nix machines):

./venv/Scripts/activate

Install the requirements:

pip install -r requirements.txt

Run the script:

python make-many-bad-requests.py

Observe the error logs thrown in the first terminal :'(