I have now worked thorugh the reverse dependencies (see list below) and intend to upload nix 0.30 soon.
aardvark-dns - patch needs dropping bpftop - no changes needed fish - bug report filed with patch fragments - patch sent to existing bug report and uploaded by jbicha glycin - bug report submitted with patch greetd - bug report filed with patch hippotat - bug report filed with patch inputplug - no changes needed. mdevctl - no changes needed meli - bug report filed with patch netavark - bug report filed with patch nswncd - no changes needed phrog - bug report filed with patch ruby-prometheus-client-mmap - bug report filed with patch rust-apple-nvram - no changes needed rust-argmax - no changes needed rust-calloop - no changes needed rust-calloop-0.10 - fix uploaded to experimental rust-cargo-mutants - fix uploaded to unstable rust-clearscreen - fix prepared but not uploaded rust-clone-file - no changes needed rust-cntr - fix prepated but not uploaded rust-command-group - fix uploaded to unstable rust-coreutils - fix prepared but not uploaded rust-ctrlc - fix uploaded to unstable rust-devicemapper - no changes needed (but package is a bit of a mess) rust-dfrs - no changes needed rust-dockworker - no changes needed rust-erbium-net - fix uploaded to unstable rust-evdev - fix uploaded to unstable rust-expectrl - fix prepared but not uploaded rust-fd-find - no changes needed rust-findutils - no changes needed rust-fs-at - no changes needed rust-glycin - fix uploaded to experimental rust-glycin-common - fix uploaded to experimental rust-glycin-utils - fix uploaded to unstable rust-home-dir - no changes needed rust-hyperfine - fix uploaded to unstable rust-input-linux - fix prepared but not uploaded rust-input-linux-sys - fix uploaded to unstable rust-iptables - no changes needed rust-just - fix uploaded to unstable rust-kanata - fix uploaded to unstable rust-laurel - no changes needed rust-libbpf-sys - fix uploaded to unstable rust-libmount - no changes needed rust-libslirp - fix uploaded to unstable rust-libspa - no changes needed rust-libsystemd - fix prepared but not uploaded rust-linescroll - fix prepared but not uploaded rust-mac-address - fix uploaded to unstable rust-mozim - fix uploaded to unstable rust-nix - main package ;) rust-nix-base32 - false positive in search rust-ofiles - no changes needed. rust-ognibuild - no changes needed. rust-peak-mem - fix uploaded to unstable rust-pipewire - fix uploaded to experimental rust-pleaser - fix prepared but not uploaded rust-privdrop - no changes needed rust-ptyprocess - fix prepared but not uploaded rust-rebuilderd-worker - fix uploaded to unstable rust-repro-env - fix uploaded to unstable rust-ripcalc - fix prepared but not uploaded rust-rtnetlink - fix uploaded to unstable rust-rustyline - fix prepared but not uploaded rust-serialport - fix prepared but not uploaded rust-sniffglue - no changes needed rust-swtchr - no changes needed. rust-termwiz - fix uploaded to unstable rust-tiny-dfr - fix uploaded to unstable rust-ttrpc - fix prepared but not uploaded rust-udevrs - fix uploaded to unstable rust-uucore - fix prepared but not uploaded rust-vsock - fix uploaded to unstable rust-wayland-client-0.29 - fix uploaded to experimental rust-wayland-commons - fix uploaded to unstable rust-wayland-cursor-0.29 - no changes needed rust-wayland-server-0.29 - no changes needed rust-xterm-query - fix uploaded to unstable rust-zbus - fix uploaded to unstable rust-zbus-1 - fix uploaded to unstable starship - bug report filed with patch swayosd - bug report filed with patch trippy - already FTBFS, bug report filed with partial patch tuigreet - no changes needed wlgreet - no changes needed

