zig build --watch crashes in bun on macos

[nektro]

Zig Version

0.14.0-dev.2987+183bb8b08

Steps to Reproduce and Observed Behavior

• clone https://github.com/oven-sh/bun (HEAD is c9709224563e9d7fa9c9e1f957af3f741420fc69 as of writing)
• run bun run build to bootstrap some generated code
• run ./vendor/zig/zig build --watch

❯ ./vendor/zig/zig build --watch
info: zig compiler v0.14.0-dev.2987+183bb8b08
Build Summary: 5/5 steps succeeded
install success
└─ check success
   └─ zig build-obj bun-debug Debug native-native.13.0 success 26s MaxRSS:1G
      └─ options success
thread 30516526 panic: reached unreachable code
/Users/meghandenny/src/bun/vendor/zig/lib/std/posix.zig:4499:22: 0x102c300b7 in kevent (build)
            .BADF => unreachable, // Always a race condition.
                     ^
/Users/meghandenny/src/bun/vendor/zig/lib/std/Build/Watch.zig:671:49: 0x102c2ee9f in update (build)
                            _ = try posix.kevent(w.os.kq_fd, &changes, &.{}, null);
                                                ^
/Users/meghandenny/src/bun/vendor/zig/lib/std/Build/Watch.zig:870:21: 0x102c30d23 in update (build)
    return Os.update(w, gpa, steps);
                    ^
/Users/meghandenny/src/bun/vendor/zig/lib/compiler/build_runner.zig:453:21: 0x102c35c57 in main (build)
        try w.update(gpa, run.step_stack.keys());
                    ^
/Users/meghandenny/src/bun/vendor/zig/lib/std/start.zig:656:37: 0x102c3fa73 in main (build)
            const result = root.main() catch |err| {
                                    ^
???:?:?: 0x1803e8273 in ??? (???)
???:?:?: 0x0 in ??? (???)
error: the following build command crashed:
/Users/meghandenny/src/bun/.zig-cache/o/5669840098cf4e8a06f7b6c32dea52bd/build /Users/meghandenny/src/bun/vendor/zig/zig vendor/zig/lib /Users/meghandenny/src/bun /Users/meghandenny/src/bun/.zig-cache /Users/meghandenny/.cache/zig --seed 0xd9205961 -Zf6d23e3e2dbf24db --watch

more environment context is that i'm on a macbook pro m3 running macOS 15.1.1

Expected Behavior

works and recompiles zig object when files change