Who I have the same questioned this topic

Phone: Google Pixel 3 - Android 10

Location: Washington, DC rural area nearby

ISP Type/Speed: Cable ~1Gbps

OPNSense Firewall Appliance - dedicated LAN connectivity and routing

WiFi - Linksys WRT3200ACM running OpenWRT 19.07.3

Just upgraded my Linksys Wireless APs (no routing done on them) from OpenWRT 19.07.2 to 19.07.3, and sense the change my Google Pixel 3 cell phone drops any call that it tries to switch to WiFi-Calling with, which is all calls because I'm in the boondocks and cellular coverage is LOW at best. I can turn off WiFi on my phone and my calls do alright over LTE as long I'm not moving around the house too much. Every call that tries to switch to WiFi goes silent, and then drops.

Any thoughts?