pipewire-0.3.78-1.fc38 forces headphones into handsfree mode when using external mic

• Headphones: Sony WH-1000XM5
• Mic: Logitech C920
• PipeWire version: pipewire-0.3.78-1
• Distribution and distribution version: Fedora Linux 38 (Workstation Edition)
• Desktop Environment: Gnome + Xorg
• Kernel version: 6.4.11-200

Description of Problem:

Headphones are forced into handsfree mode (HSP/HFP) when using an external microphone. Unable to use headphones in headset mode (A2DP+LDAC) alongside the external mic.

How Reproducible:

Always

Steps to Reproduce:

1. Connect external mic.
2. Set external mic as default input
3. Connect headphones and make sure they're in headset mode (A2DP+LDAC)
4. Join a "Google Meet", "MS Teams" or start using mic on https://mictests.com/.

Actual Results:

The headphones instantly switch to handsfree mode (HSP/HFP). Any attempt to revert to headset mode (A2DP+LDAC) results in non-working external mic.

Expected Results:

Headphones must be able to stay in headset mode (A2DP+LDAC) when using an external mic.

Workaround:

Downgrading to pipewire-0.3.77-3.fc38 solves the issue.