JSON parsing incorrectly in Release* modes

[okx-code]

Zig Version

0.10.0-dev.3369+fdaf9c40d

This bug is not present in version 0.9.1.

Steps to Reproduce

const std = @import("std");

const StrangeStruct = struct {
    name: ?[]u8 = null, // it works if you remove this field
    num: ?i8 = null,
    nodes: ?[]StrangeStruct = null, // OR if you remove this one
};

pub fn main() anyerror!void {
    var messageBuf: []const u8 = "{\"num\":1}";

    var tokens = std.json.TokenStream.init(messageBuf);
    const json = try std.json.parse(StrangeStruct, &tokens, .{});

    std.log.err("Printing", .{});
    if (json.num) |num| {
        // should print the number, but doesn't in ReleaseSafe, ReleaseSmall, and ReleaseFast
        std.log.err("num {d}", .{num});
    }
}

Save to bug.zig and compile with zig build-exe -O ReleaseSafe bug.zig and zig build-exe -O Debug bug.zig

Expected Behavior

I expected the num field to be printed in both Debug and ReleaseFast/Safe/Small modes.

Actual Behavior

The num field is only printed in Debug mode.