Memory leak when using FixedBufferAllocator about zbor HOT 2 CLOSED

test "doom" {
    //var buffer: [256]u8 = undefined;
    //var fba = std.heap.FixedBufferAllocator.init(&buffer);
    //const allocator = fba.allocator(); // <- OutOfMemory
    const allocator = std.testing.allocator; // <- works

    var i: usize = 0;
    while (i < 1024) : (i += 1) {
        var x = try DataItem.text(allocator, "hello, world");
        var di = DataItem{ .tag = Tag{ .number = i, .content = try allocator.create(DataItem) } };
        di.tag.content.* = x;
        defer di.deinit(allocator);
        std.debug.print("i: {d}, c: {s}\n", .{ di.tag.number, di.tag.content.text });
    }
}