Generally speaking, yes, Zig can also crosscompile for macOS. You might have encountered a bug in Zig or maybe it's a problem related to the dll file you're providing (IIRC ARM M1 macs need position independent code, for example).
I recommend trying with a recent build of Zig (you can get nightlies from the official website) and if it's still broken there, then open an issue on GitHub.
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Generally speaking, yes, Zig can also crosscompile for macOS. You might have encountered a bug in Zig or maybe it's a problem related to the dll file you're providing (IIRC ARM M1 macs need position independent code, for example).
I recommend trying with a recent build of Zig (you can get nightlies from the official website) and if it's still broken there, then open an issue on GitHub.