[Python] Why can I not see the stacktrace for an error in Kibana -> Observability -> Errors...

Context: We're using Elastic APM with our Flask application. We have a managed Elastic Cloud instance.

Problem: For an error in Kibana -> Observability -> Errors section, I only see the message: "No stack trace available.". However, when I look inside index logs-apm.error*, I see the stacktrace object with all details at path error.exception.stacktrace.

My flask configuration:

from flask import Flask
from elasticapm.contrib.flask import ElasticAPM

app = Flask(__name__)

# Configure Elastic APM
app.config['ELASTIC_APM'] = {
'SERVICE_NAME': '<APP_NAME>',
'SECRET_TOKEN': '<TOKEN>',
'SERVER_URL': '<URL>',
"ENVIRONMENT": "staging",
}

apm = ElasticAPM(app)


def dummy():
return 1 / 0

@app.route('/test-me')
def home():
dummy()
return 'Hello, World!'


Kibana screenshot: enter image description here

I tried the app with FLASK_ENV='production' and FLASK_DEBUG = 0 without success.

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