Recently my earbuds stopped switching audio streams when entering a call. I don't have any other devices connected via Bluetooth so there is no reason for my phone not to switch streams. Also the settings for Phone calls and call history are enabled for the earbuds.

 

Devices in question:

Razer Hammerhead True Wireless X (product num: RZ12-03830100 firmware ver: 1.2.1.0)

Pixel 6a (kernel ver: 5.10.198-android13-4-00036-g11d7e4f57f68-ab11392938 build num: AP31.240322.027)