Bluetooth wouldn't connect after companion app crash

Started doing work, app crashed. I restarted it. Sensors would not connect. Went in the the menu to reconnect them. and they are found. Soon as I exit menu, they disconnected again. I force quit the app and restart. Same results.

iPhone X (iOS14 Beta 4), Companion App 3.17.1 (1051)
Apple TV, latest software
Magene Trainer

The spike at the end are where sensor reconnected and then lost connection again:
Apparently can’t upload photos

iPhone crash log is here:
(also can’t link crash files here…)