Weird battery drain on iPhone 14 pro max

My phone drained its battery while I was at work. It was in my pocket and I could feel it get hot during the day while the weather was around 10 degrees Celsius.

never had such an issue before. From 90% at 9:30am to 10% by 4:30 pm, while the phone was only used for 1 hour and 20 minutes.

Battery data in settings is not available either. Attaching a screenshot for the same.

Is it a bug? Did anyone else go through something similar?