Let's capture more logs from pulseaudio:
Please edit /usr/lib/systemd/user/pulseaudio.service
comment out the existing line starting with ExecStart and add a new one ExecStart=/usr/bin/pulseaudio -vvvv --log-target=file:/tmp/a.txt
reboot
tail -f /tmp/a.txt
Then connect the BT headphone, after fails, please upload the log starting from you connect the BT headphone.
Let's capture more logs from pulseaudio:
Please edit /usr/lib/ systemd/ user/pulseaudio .service
comment out the existing line starting with ExecStart and add a new one ExecStart= /usr/bin/ pulseaudio -vvvv --log-target= file:/tmp/ a.txt
reboot
tail -f /tmp/a.txt
Then connect the BT headphone, after fails, please upload the log starting from you connect the BT headphone.