Possible recursive-nix regression "<store path> already exists in the sandbox"

[mightyiam]

Describe the bug

$ nix flake check in this repo used to work with whatever Nix version I was using at the time. And with 2.32.2 it no longer passes, but fails with

error: store path '/nix/store/vj1c3wf9c11a0qs6p3ymfvrnsdgsdcbq-source-stdenv.sh' already exists in the sandbox

The checks that are failing make use of recursive-nix. Here is one of them.

Steps To Reproduce

Just run nix flake check in that repo.

Expected behavior

Would be great if in a future version of Nix these flake checks pass again.
Alternatively, if the checks are somehow erroneous, I'd appreciate a pointer on that.

Metadata

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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@shivaraj-bh

[xokdvium]

From a cursory glance this looks like a regression caused by (haven't bisected yet) d4ef822.

Specifically this change looks suspicious: d4ef822#diff-ac4d64db8e0fba7040c6a8bf9ab4a09e9408bdb9f2d8ddca8b3a773ef6113bf8L843-L844