Transitive lazy dependencies are not fetched

[ianprime0509]

Zig Version

0.14.0-dev.477+08cddaf11

Steps to Reproduce and Observed Behavior

1. Clone https://github.com/ianprime0509/pathological-packages and check out the transitive-lazy-dependency branch (commit 0eba431bfea69a0b46e7c0e5fc845a5c2c91bf6f)
2. Run zig build

Error:

thread 1019738 panic: unable to find module 'main'
/var/home/ian/src/zig/lib/std/Build.zig:1888:18: 0x116cf07 in module (build)
            panic("unable to find module '{s}'", .{name});
                 ^
/var/home/ian/src/pathological-packages/build.zig:17:72: 0x111c3ec in build (build)
    exe.root_module.addImport("lazy_dependency", lazy_dependency.module("main"));
                                                                       ^
/var/home/ian/src/zig/lib/std/Build.zig:2147:33: 0x1101833 in runBuild__anon_10316 (build)
        .Void => build_zig.build(b),
                                ^
/var/home/ian/src/zig/lib/compiler/build_runner.zig:314:29: 0x10fc9b4 in main (build)
        try builder.runBuild(root);
                            ^
/var/home/ian/src/zig/lib/std/start.zig:532:37: 0x10d88f5 in posixCallMainAndExit (build)
            const result = root.main() catch |err| {
                                    ^
/var/home/ian/src/zig/lib/std/start.zig:277:5: 0x10d8411 in _start (build)
    asm volatile (switch (native_arch) {
    ^
???:?:?: 0x8 in ??? (???)
Unwind information for `???:0x8` was not available, trace may be incomplete

error: the following build command crashed:
/var/home/ian/src/pathological-packages/.zig-cache/o/d9f0b52a358eb1bd754724aec1f0ec19/build /var/home/ian/src/zig/build/stage3/bin/zig /var/home/ian/src/zig/lib /var/home/ian/src/pathological-packages /var/home/ian/src/pathological-packages/.zig-cache /var/home/ian/.cache/zig --seed 0x6c218f91 -Z792625fefc8b025c

The error can be resolved by first checking out the lazy-dependency branch (commit e1d9f46cfc6d71475ac9fe77a85555a606712e0b) and running zig build there (which fetches the lazy dependency on the branch single-module into the cache).

Expected Behavior

The initial zig build on the transitive-lazy-dependency branch should fetch all necessary dependencies and succeed.

The motivating example behind this issue is I have a WIP library zig-libxml2 which fetches upstream sources for libxml2 and libxslt and builds them, but the upstream libxslt tarball is a lazy dependency, enabled only with a build option xslt. Hence, due to this issue, it currently isn't possible to depend on zig-libxml2 from another project and try to use libxslt.