I have two Wi-Fi’s, one for 5GHz and one for the old 2.4GHz. They both are connected to the same LAN network, just using slightly different Wi-Fi names.
Sonos speakers are connected to the 2.4GHz network, and my phone is on the 5GHz network. This has always worked fine.
After the new update I have to connect my phone to the 2.4GHz Wi-Fi or my phone can’t see the speakers, why?