Errors not showing in flask server

edit

Consider the following minimal flask server

import rospy
from flask import Flask, request, Response, make_response

if __name__ == '__main__':
    # Shutdown is handled by Flask
    rospy.init_node("test", disable_signals=True)
    app = Flask(__name__)

    @App.errorhandler(Exception)
    def server_error(error):
        print(str(error))
        rospy.logerror(error) # For some reason logerror doesn't work in errorhandler
        return f"Error: {error}", 500

    @App.route('/test', methods=['POST'])
    def execute():
        raise Exception("my error")
        return Response(status=200, headers={})

    rospy.loginfo("Starting server...")
    app.run(host="127.0.0.1", port=50002)

When POSTing to 127.0.0.1:50002/test, the following 2 lines are printed

my error
500 Internal Server Error: The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

It seems rospy.logerror failed and caused another exception to be raised leading to the 500 Internal Server Error. Why is this happening and how do I solve this?

PS:: Why is "@ app" converted to "@App" in the post? This doesn't happen in the preview.