error[E0588]: packed type cannot transitively contain a `#[repr(align)]` type

Input C/C++ Header

typedef struct _IMAGE_TLS_DIRECTORY64 {
    ULONGLONG StartAddressOfRawData;
    ULONGLONG EndAddressOfRawData;
    ULONGLONG AddressOfIndex;         // PDWORD
    ULONGLONG AddressOfCallBacks;     // PIMAGE_TLS_CALLBACK *;
    DWORD SizeOfZeroFill;
    union {
        DWORD Characteristics;
        struct {
            DWORD Reserved0 : 20;
            DWORD Alignment : 4;
            DWORD Reserved1 : 8;
        } DUMMYSTRUCTNAME;
    } DUMMYUNIONNAME;

} IMAGE_TLS_DIRECTORY64;

typedef IMAGE_TLS_DIRECTORY64 * PIMAGE_TLS_DIRECTORY64;cases

Bindgen Invocation

    // Configure and generate bindings.
    let bindings = bindgen::builder()
        .header("../inc/libnet.h")
        //.clang_arg("-x").clang_arg("c++")
        .generate()
        .expect("Couldn't write bindings!");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());

    // Write the generated bindings to an output file.
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");

or

$ bindgen input.h --whatever --flags

Actual Results

error[E0588]: packed type cannot transitively contain a `#[repr(align)]` type

#[repr(C, packed(4))]
#[derive(Copy, Clone)]
pub struct _IMAGE_TLS_DIRECTORY64 {
    pub StartAddressOfRawData: ULONGLONG,
    pub EndAddressOfRawData: ULONGLONG,
    pub AddressOfIndex: ULONGLONG,
    pub AddressOfCallBacks: ULONGLONG,
    pub SizeOfZeroFill: DWORD,
    pub __bindgen_anon_1: _IMAGE_TLS_DIRECTORY64__bindgen_ty_1,
}

and/or

// Insert the (incorrect/buggy) generated bindings here

and/or

Insert compilation errors generated when compiling the bindings with rustc here

Expected Results

Reproduce the report using the shown bindgen invocation and the IMAGE_TLS_DIRECTORY64 definition, then inspect the generated bindings.rs output. Confirm that the generated packed struct triggers E0588 and that the completed fix produces bindings that compile while preserving the reported C/C++ layout.