My Thinkpad from the same 2022 timeframe (a Z13 Gen 1) was very awful all around, particularly w.r.t. sleep. Lenovo serviced it multiple times, never fixing it and refusing to complete a return under warranty. (Happy ending: Laptop got stolen. Insurance paid.)

I have the hope that Lenovo acquiring Phoenix will fix some of the awfulness.

There is a guide on Reddit, "How to enter advanced BIOS options on Gen 1 T15(g/p), P15(v), P17" which also applies to each generation of P16. It's possible a setting in there will finally cure your laptop's insomnia?