I have similar timelines as you. AOR: 1st Sept, Biometrics done on the 7th of December. Medical updated automatically as of 5th Jan, 2024. But since then the application has been in Background Check. It looks like your BGC completed within a month, did you have to raise a web form or did they ask for any other input?
No. However, I believe my application was very straightforward.
1) No dependents
2) Only Canadian education and work experience.
3) Work experience only with 1 employer (multiple positions, but same employer)
4) Minimal address history in Canada (all in one province)
5) Only 1 travel history (1 week trip to the US)
6) No refusals or other abnormalities.