Lenovo used to ship Intel AX200 with all Legion laptops. Later in 2021 they started mixing Mediatek and Realtek WiFi cards.
Many of our members have reported issues with all non-Intel WiFi cards.
You can find discussion about this topic on our Discord in channel Realmediakek
Fortunately for us, WiFi cards on Legions are not soldered and are replaceable, using M.2 2242 standard