General issue Python:Unable to recognize calling a method through an instance member of a class

when evaluate """private API::Node connection()""", the query result should find """self.orm.connection()""".But the query result is none
```
private API::Node dbClient() {
result = API::moduleImport("dbutils").getMember("pooled_db").getMember("PooledDB").getReturn()
}

private API::Node connection() {
result = dbClient().getMember("connection").getReturn()
}
```

python demo here
```
import flask
import pymysql
from flask import request
from dbutils.pooled_db import PooledDB

app = flask.Flask(__name__)

class Database:
def __init__(self):
self.orm = self.dbpool()

def dbpool(self):
pool = PooledDB(
creator=pymysql
)
return pool

def conn(self):
self.orm.connection()

@app.route('/search')
def search():
query = request.args.get('query')
database = Database()
database.conn()
database.orm.connection()
return f"Search query: {query}"

if __name__ == '__main__':
app.run()
```

Start with the provided Python demo and the query for `private API::Node connection()`; reproduce why `self.orm.connection()` is not found while the direct call is present. Trace the CodeQL Python member and return-value resolution involved, then confirm the query result includes the instance-member call.

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