Pipewire issues with element-desktop and schildichat-desktop

my pipewire config (literally almost just what is in the wiki):

{ config, pkgs, ... }:
	environment.systemPackages = with pkgs; [ pamixer ];
	security.rtkit.enable = true;
	sound.enable = false;
	services.pipewire = {
		enable = true;
		wireplumber.enable = true;
		pulse.enable = true;
		alsa.enable = true;
		alsa.support32Bit = true;
		jack.enable = false;
	environment.etc = {
		"wireplumber/bluetooth.lua.d/51-bluez-config.lua".text = 
			bluez_monitor.properties = {
				["bluez5.enable-sbc-xq"] = true,
				["bluez5.enable-msbc"] = true,
				["bluez5.enable-hw-volume"] = true,
				["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"

the issue is that sound in calls doesn’t work properly
at first everything works as intended, I can hear my call partner, and they can hear me
but after a few seconds the sound just stops working, and I can confirm in pavucontrol that no audio stream exists
I have tried enabling jack, disabling alsa (makes sound in element stopping to work entirely). no success
I have literally no idea what could be wrong, or if the problem is just not on my site.

Here is my config repository: quantenzitrone/nix-config: config for my NixOS machine - nix-config - Codeberg.org