pulseaudio[2636]: GetManagedObjects() failed: org.freedesktop.DBus.Error.TimedOut: Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)
I’m don’t know about this issue, but I would use pipewire instead of pulseaudio, it’s supposed to replace it at some points (ubuntu already did it), and is way less buggy in my experience, has much better bluetooth support, and is compatible with jack and pulseaudio’s protocols.
Also, have you added hardware.bluetooth.enable = true;? Seems like it’s needed to enable bluetooth and seems like your pulseaudio has troubles finding bluez, which is in charge of bluetooth.
Also, given the numerous posts you just wrote, do you get any visible implications of this error (like no bluetooth, crash of the system…). Please give more details than just an error. Also, sometimes the context around the error is important to understand it better, so it might be worth including relevant lines before and after.