Intermittant CI failure

[Ericson2314]

Describe the bug

We've seen this a bit as of late:

error: builder for '/nix/store/q0v2sv4nlx21d7576s6zyi9mx3r28wzk-equal-contents-trivial-patch-does-not-change-source-contents.drv' failed with exit code 1;
       last 25 log lines:
       > │ │   --- /nix/store/lpda5vlq5zxp9g05gm3mk2s6san56zx1-nix-source-patched-source/tests/functional
       > │ ├── +++ /nix/store/wjvfhn8rmg717gqw066b21776yiw3iiz-4hbkn42l27s1mk8vmzqkjp2m5ljcc73k-source/tests/functional
       > │ │ │   --- /nix/store/lpda5vlq5zxp9g05gm3mk2s6san56zx1-nix-source-patched-source/tests/functional/lang
       > │ │ ├── +++ /nix/store/wjvfhn8rmg717gqw066b21776yiw3iiz-4hbkn42l27s1mk8vmzqkjp2m5ljcc73k-source/tests/functional/lang
       > │ │ │ ├── stat {}
       > │ │ │ │ @@ -1,7 +1,7 @@
       > │ │ │ │
       > │ │ │ │ +  Size: 32768      Blocks: 64         IO Block: 4096   directory
       > │ │ │ │ -  Size: 28672            Blocks: 64         IO Block: 4096   directory
       > │ │ │ │  Device: 8,1      Access: (0555/dr-xr-xr-x)  Uid: (65534/  nobody)   Gid: (65534/ nogroup)
       > │ │ │ │
       > │ │ │ │  Modify: 1970-01-01 00:00:01.000000000 +0000
       > │ │ │ ├── stat {}
       > │ │ │ │ @@ -1,7 +1,7 @@
       > │ │ │ │
       > │ │ │ │ -  Size: 28672          Blocks: 64         IO Block: 4096   directory
       > │ │ │ │ +  Size: 32768            Blocks: 64         IO Block: 4096   directory
       > │ │ │ │  Device: 8,1      Access: (0555/dr-xr-xr-x)  Uid: (65534/  nobody)   Gid: (65534/ nogroup)
       > │ │ │ │
       > │ │ │ │  Modify: 1970-01-01 00:00:01.000000000 +0000
       >
       > Contents must be equal, but were not!
       >
       > +: expected,   at /nix/store/wjvfhn8rmg717gqw066b21776yiw3iiz-4hbkn42l27s1mk8vmzqkjp2m5ljcc73k-source
       > -: unexpected, at /nix/store/lpda5vlq5zxp9g05gm3mk2s6san56zx1-nix-source-patched-source
       For full logs, run:
         nix log /nix/store/q0v2sv4nlx21d7576s6zyi9mx3r28wzk-equal-contents-trivial-patch-does-not-change-source-contents.drv

CC @roberth it was introduced in #12503. Is this exposing a Nix bug, or is it a buggy test?

Steps To Reproduce

Expected behavior

Metadata

Additional context

Checklist

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

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