Thank you for the report. From the wireplumber status, the Bluetooth
device has been configured as both the default sink and the default
source:

Default Configured Devices:
  0. Audio/Sink    bluez_output.28:11:A5:AF:C3:AC
  1. Audio/Source  bluez_input.28:11:A5:AF:C3:AC

Keeping a Bluetooth input active forces the device toward the HFP/HSP
headset profile, which may explain the repeated a2dp-source profile
connect failed ... Device or resource busy and the SCO traffic in the
journal.

Could you try clearing the stored state and retesting?

systemctl --user stop wireplumber pipewire pipewire-pulse
rm -rf ~/.local/state/wireplumber
systemctl --user start wireplumber pipewire pipewire-pulse

Then reconnect the headphones and, while audio is playing, attach the
output of:

wpctl status

looking to confirm the device sits in A2DP with no active source node.

** Changed in: pipewire (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2154643

Title:
  Bluetooth audio "scratching"/crackling with A2DP on Kubuntu 26.04
  (works on KDE Neon)

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