IOS 13.2 did not fix it for me. Today, I set the wifi 'ask to join networks' to off and 'auto join hotspot' to never. I think it may have improved (hopeful wishing), but won't know for sure until my commute to work tomorrow. I still got drop outs when I pulled into the grocery store (around the time I was checking wifi networks and an Xfinity truck parked further down - xfinity wifi appeared on my wifi list).
With the Mini's, I think you get the wireless charging unit in the armrest if you have CarPlay (no way to separate the options), at least it was with my 2019 US model (the charger is too small for the plus/ max though). My dropouts happen whether I have it in the armrest charger or sitting out.