My Sony WF-1000X BT headphones don't connect properly under the beta firmware. They show on the list of devices available, and on a reset of the phone auto connect but don't auto connect like they used to when I turn them on. Sometimes connection hangs when I try to manually do it, sometimes this is fixed by turning BT off/on again but sometimes only a reboot will sort it. Have the same issue with sporadic connectivity to my Huawei Watch too. Neither issue was present under the old firmware.
I should have added, I tried forgetting and re-adding the devices but it didn't make any difference.