Laravel Ajax Update Error

Siang gan, mau tanya tentang ajax update di laravel pakai 1 modal buat create sama edit. Proses create berhasil, edit (buat munculin data di modal) berhasil, pas klik simpan buat update malah yang jalan create, jadinya malah nambah data baru.

Route

Route::put('/dashboard/bidang-tugas/update', [Bidang_TugasController::class, 'update'])->middleware('auth')->name('update_data');

Edit button

<a href="#" id="{{ $dbt->slug }}" class="btn btn-warning edit-button me-2" data-bs-tooltip="tooltip" data-bs-placement="top" data-bs-title="Ubah" data-bs-toggle="modal" data-bs-target="#tambahBidangTugasModal"><i class="fa-solid fa-pencil"></i></a>

Controller

public function update(Request $request, Bidang_Tugas $bidang_tuga)
    {
        $rules = [
            'bidang_tugas' => 'required|unique:bidang_tugas|max:100',
        ];

        $validatedData = $request->validate($rules);
        $validatedData['slug'] = str_replace(' ', '-', $request->bidang_tugas);
        Bidang_Tugas::where('id', $bidang_tuga->id)->update($validatedData);
        
        return response()->json([
            'status' => 200,
        ]);
    }

Modal

<div class="modal fade" id="tambahBidangTugasModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="exampleModalLabel">Tambah {{ $title }}</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <form action="#" method="POST" id="tambah_bidang_tugas_form" enctype="multipart/form-data">
                @csrf
                <div class="modal-body p-4 bg-light">
                    <div class="mb-3">
                        <label for="bidang_tugas" class="form-label">Bidang Tugas</label>
                        <input type="text" class="form-control" id="bidang_tugas" name="bidang_tugas" autofocus>
                        <div id="error-bidang-tugas" class="invalid-feedback">
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-outline-secondary me-2" data-bs-dismiss="modal">Batal</button>
                    <button type="submit" id="bidang_tugas_simpan" class="btn btn-primary">Simpan</button>
                </div>
            </form>
        </div>
    </div>
</div>

Script edit dan update

// Script edit data
        $(document).on('click', '.edit-button', function(e) {
            e.preventDefault();
            let slug = $(this).attr('id');
            $.ajax({
                url: `/dashboard/bidang-tugas/${slug}/edit`,
                method: 'get',
                success: function(response) {
                    $("#slug").val(response.slug);
                    $("#bidang_tugas").val(response.bidang_tugas);
                }
            });
        });

        // Script update data
        $("#tambah_bidang_tugas_form").submit(function(e) {
            e.preventDefault();
            let slug = $(this).attr('id');
            const fd = new FormData(this);
            fd.append('slug', slug);
            $("#bidang_tugas_simpan").text('Simpan');
            $.ajax({                
                url: '/dashboard/bidang-tugas/update',
                method: 'put',
                data: fd,
                cache: false,
                contentType: false,
                processData: false,
                dataType: 'json',
                success: function(response) {
                    if (response.status == 200) {
                        Toastify({
                            text: "Data berhasil diubah!",
                            duration: 5000,
                            newWindow: true,
                            gravity: "top",
                            position: "center",
                            stopOnFocus: true,
                            style: {
                                background: "#71dd37",
                            },
                        }).showToast();
                        fetchAllEmployees();
                    }
                    $("#bidang_tugas_simpan").text('Simpan');
                    $("#tambah_bidang_tugas_form")[0].reset();
                    $("#tambahBidangTugasModal").modal('hide');
                }
            });
        });