+(shell.sh:21) nix shell -f shell-hello.nix hello-symlink -c hello
+(shell.sh:21) grep 'Hello World'
+(/home/jcericson/src/nix/master/tests/functional/common/functions.sh:341) checkGrepArgs 'Hello World'
+(/home/jcericson/src/nix/master/tests/functional/common/functions.sh:290) local arg
+(/home/jcericson/src/nix/master/tests/functional/common/functions.sh:291) for arg in "$@"
+(/home/jcericson/src/nix/master/tests/functional/common/functions.sh:292) [[ Hello World != \H\e\l\l\o\ \W\o\r\l\d ]]
+(/home/jcericson/src/nix/master/tests/functional/common/functions.sh:342) command grep 'Hello World'
this derivation will be built:
  /tmp/nix-shell.FPcQP5/nix-test/main/shell/store/bbqd8bbcr4i32nahm7ygqhwpwj3xfidm-hello-symlink.drv
building '/tmp/nix-shell.FPcQP5/nix-test/main/shell/store/bbqd8bbcr4i32nahm7ygqhwpwj3xfidm-hello-symlink.drv'...
error: 'tmp' is too short to be a valid store path

FYI in re https://git.lix.systems/lix-project/lix/issues/750, it seems like nixos/nix fixed this by accident, but still has some amount of an underlying bug (or at least poor documentation of the treatment of the underlying bug): the info.path in this spot is the bad 9hagx value

https://github.com/NixOS/nix/blob/3032512425a09fc58f2d658442043894e0aab256/src/libfetchers/tarball.cc#L74-L83

repro:

builtins.fetchTree {
  narHash = "sha256-WmkitUnTwTCCdq0a08EdUBC/UTo/i4+xwD3mk19NA1Q=";
  type = "file";
  url = "https://releases.lix.systems/lix/lix-2.90.0/manifest.nix";
}