Seems it has trouble downloading something.
./broadcom -> /nix/store/k7b2hrhddhlq12mkdnchk4lr0x9hpv25-dtbs-filtered/./broadcom
'./broadcom/bcm2711-rpi-4-b.dtb' -> '/nix/store/k7b2hrhddhlq12mkdnchk4lr0x9hpv25-dtbs-filtered/./broadcom/bcm2711-rpi-4-b.dtb'
'./broadcom/bcm2711-rpi-400.dtb' -> '/nix/store/k7b2hrhddhlq12mkdnchk4lr0x9hpv25-dtbs-filtered/./broadcom/bcm2711-rpi-400.dtb'
building '/nix/store/m8q3i7f90qlhgb9fh71f0bmpl6gn53dj-rpi4-cpu-revision-dtbo.drv'...
building '/nix/store/dap24ai1vc9qsynmd7v4gw371i3m0ffg-rpi4-vc4-fkms-v3d-overlay-dtbo.drv'...
building '/nix/store/xh7awwwwdpr7v7hpgi0ngr5lgxir8bhy-device-tree-overlays.drv'...
./broadcom -> /nix/store/g1vryd1fi3rnp14lclkpvviq26lnlfk3-device-tree-overlays/./broadcom
'./broadcom/bcm2711-rpi-4-b.dtb' -> '/nix/store/g1vryd1fi3rnp14lclkpvviq26lnlfk3-device-tree-overlays/./broadcom/bcm2711-rpi-4-b.dtb'
'./broadcom/bcm2711-rpi-400.dtb' -> '/nix/store/g1vryd1fi3rnp14lclkpvviq26lnlfk3-device-tree-overlays/./broadcom/bcm2711-rpi-400.dtb'
warning: error: unable to download 'https://cache.nixos.org/nar/0y3bmk5fq5sbgh8kq8wvkb2a5v0zsn157k690qci2frjfbgq0ky0.nar.xz': HTTP error 206 (curl error: Stream error in the HTTP/2 framing layer); retrying from offset 417999988 in 510 ms
Applying overlay rpi4-cma-overlay to bcm2711-rpi-4-b.dtb... ok
Applying overlay rpi4-vc4-fkms-v3d-overlay to bcm2711-rpi-4-b.dtb... ok
Applying overlay rpi4-cpu-revision to bcm2711-rpi-4-b.dtb... ok
Applying overlay audio-on-overlay to bcm2711-rpi-4-b.dtb... DTOVERLAY[error]: can't find symbol 'audio'
error: builder for '/nix/store/xh7awwwwdpr7v7hpgi0ngr5lgxir8bhy-device-tree-overlays.drv' failed with exit code 1
error: 1 dependencies of derivation '/nix/store/fdjb2x88r97hqcigl5nxfkvrkajq0ghk-nixos-system-pi-23.11.20240604.a2e1d04.drv' failed to build