Find My Device problem

I found an interesting problem with my 3rd gen Airpods. I 'lost' it few days ago, so I decided to turn the Lost mode on. I tried to find it with the app, but based on the latest location info, I couldn't find it. I tried to 'beep' it, or use the search option, but all of those tries was not successful. After 2 days, I found it in a very small pocket of my backpack, almost fully charged (81% case, 100% airpods). My question is: How the location didn't updated, and how it couldn't connect to my iPhone 11 ProMax if it was 2-3 meters away from me? While I tried, I used the 16.1 (20B5050f). After I opened the case of my AirPod, it immediately connected and says my airpod is here but with the app, I couldn't find it in 2 days, without even a location update.