regression: `@embedFile` can no longer find `root` or `std` modules

[xdBronch]

Zig Version

0.12.0-dev.2158+4f2009de1

Steps to Reproduce and Observed Behavior

test {
    _ = @embedFile("root");
}

error: unable to open 'root': FileNotFound
    _ = @embedFile("root");
                   ^~~~~~

same happens for std as well but not builtin or any other modules as far as i can tell. specifying the root module on the CLI does not help

Expected Behavior

successful compile, this previously worked. i havent tested yet but since its module related my natural assumption is this is caused by #18160.

[xdBronch]

this was fixed sometime between 0.14 and now