While making calls using a paired phone, I observe the following audio corking (or lack thereof) issues that seem related to Wireplumber policy:

• If I play BT A2DP audio in the mediaplayer and pause it before making a call with the Phone app, it will not play audio when unpaused.  If I switch to local media playback and then back to BT A2DP again, it starts working again.
• If I have audio playing in the mediaplayer and make a call with the Phone app, the mediaplayer is not corked, but plays over the phone audio.
• If I make a call using the Phone app, on the first call it connects and I hear audio from the callee side, but on subsequent calls there is no audio from the callee side.

If you want separate issues opened for these usecases, let me know and I'll do so.