Swapfile does not seem to work if randomEncryption.enable = true

Help
1

Hi,
I have the following swap configuration in my configuration.nix on a system with 8GB of RAM

  swapDevices = [ {
    device = "/var/lib/swapfile";
    size = 16*1024;
    priority = 2;
    # https://nixos.wiki/wiki/Swap#Encrypt_swap_with_random_key
    randomEncryption.enable = true;
  } ];
  # add a zramSwap 29% of physical RAM size
  # This refers to the uncompressed size, actual memory usage will be lower.
  zramSwap = {
  	enable = true;
  	priority = 4;
  	memoryPercent = 29;  	
  };

The system builds fine, but if my Swap usage exceeds the ~2GB of zramZwap it just completely freezes. Can’t use keyboard shortcuts to close windows, can’t even move the mouse cursor. At first I thought my SSD was just very slow so I left it running over night, still doesn’t do anything. If I remove randomEncryption.enable = true; and rebuild I can use the full ~18GB of Swap, the system just gets slow (as expected) but does not completely freeze up.