As in the subject, I would like to only display the thead when there is data in the table. This works on first run, but fails on subsequent runs. Debug.datables.net was https://debug.datatables.net/ikoqes, but doesn't work for me. You can see some of the things I've tried in commented code. My code is:

    let table = $('#results-table').DataTable({
        ajax: {
            type: 'POST',
            beforeSend: function (xhr) {
                xhr.setRequestHeader("XSRF-TOKEN",
                    $('input:hidden[name="__RequestVerificationToken"]').val());
            },
            data: function (d) {
                return $.extend({}, d, {
                    cycleId: $('#cycle-select').val(),
                    grade: $('#grade-select').val(),
                    interventionGroupId: $('#intervention-group-select').val(),
                    planStatusId: $('#plan-status-select').val(),
                    subjectId: $('#subject-select').val(),
                    tier: $('#tier-select').val()
                })
            },
            dataSrc: '',
            error: (result => {
                if (result.status === 400) {
                    window.location.href = window.resolveUrl("~/Index");
                }
                $("#server-error").html(result.responseJSON);
                $('#results-table_processing').hide();
            })
        },
        columns: [
            {
                className: 'text-nowrap',
                data: 'FullName',
                title: 'Name',
                render: ((data, _, row) => {
                    return '<a href="../../Student/StudentDetail/' + row.StudentID + '" title="View Student Detail">' + data + '</a>';
                }),
            },
            { orderable: false, data: 'StudentID', title: 'Student ID', className: 'text-center' },
            { orderData: [2, 0], data: 'Grade', title: 'Grade', className: 'text-center' },
            { orderData: [3, 0], data: 'HomeRoom', title: 'Homeroom', className: 'text-center' },
            { orderable: [4, 0], data: 'TierDescription', title: 'Tier', className: 'text-center' },
            {
                orderData: [5, 0],
                data: 'PlanDate',
                title: 'Plan Date',
                className: 'text-nowrap',
                render: ((data, type, row) => {
                    if (type === 'display') {
                        return '<a href="../../Groups/GroupDetails/' + row.InterventionGroupID + '" title="Click to view group">' + moment(data).format('MM/DD/YYYY') + '</a>';
                    }
                    return data;
                }),
            },
            {
                orderData: [6, 0],
                data: 'GroupName',
                title: 'Group Name',
                className: 'text-nowrap',
                render: ((data, type, row) => {
                    if (type === 'display') {
                        return '<a href="../../Groups/GroupDetails/' + row.InterventionGroupID + '" title="Click to view group">' + data + '</a>';
                    }
                    return data;
                }),
            },
            {
                orderable: false,
                data: 'Programs',
                title: 'Programs',
                render: ((data, type, row) => {
                    if (type === 'display') {
                        var badges = '';
                        if (row.IsPlan504) {
                            if (access504) {
                                badges += '<a class="student-badge badge badge-pill badge-504Plan px-2 mb-2 mr-2 text-decoration-none" href="/itrackerteams/StudentDetails?StudentID='
                                    + row.StudentID + '" target="_blank" title="504 Plan (' + row.DisabilityCode + ' - ' + row.DisabilityCodeDescription + ')">504</a>';
                            } else {
                                badges += '<span class="student-badge badge badge-pill badge-504Plan px-2 mb-2 mr-2 text-decoration-none cursor-default" title="504 Plan ('
                                    + row.DisabilityCode + ' - ' + row.DisabilityCodeDescription + ')">504</span>';
                            }
                        }
                        if (row.IsELL) {
                            if (ellAccess) {
                                badges += '<a class="student-badge badge badge-pill badge-EL mb-2 mr-2 text-decoration-none" href="/EL/Reports/rptStudentDetail?StudentID='
                                    + row.StudentId + '" target="_blank" title="English Learner (' + row.ELLInstructionType + ' - ' + row.ELLProgramType + ')">EL</a>';
                            } else {
                                badges += '<span class="student-badge badge badge-pill badge-EL mb-2 mr-2 text-decoration-none cursor-default" title="English Learner ('
                                + row.ELLInstructionType + ' - ' + row.ELLProgramType + ')">EL</span>';
                            }
                        }
                        if (row.IsGifted) {
                            badges += '<a class="student-badge badge badge-pill badge-GT px-2 mb-2 mr-2 text-decoration-none cursor-default" title="Gifted and Talented">G&T</a>';
                        }
                        if (row.IsSpecialEd) {
                            if (relatedServiceAccess) {
                                badges += '<a class="student-badge badge badge-pill badge-SpE px-2 mb-2 text-decoration-none" href="/RelatedServices/Student/StudentDetail?StudentId='
                                    + row.StudentID + '" target="_blank" title="Special Education (' + row.SpecialEdCode + ' - ' + row.SpecialEdDescription + ')">SpEd</a>';
                            } else {
                                badges += '<span class="student-badge badge badge-pill badge-SpE px-2 mb-2 text-decoration-none cursor-default" title="Special Education ({{SpecialEdDetailCode}} - {{SpecialEdDetailDescription}})">SpEd</span>';
                            }
                        }
                        if (row.IsSpeech) {
                            if (relatedServiceAccess) {
                                badges += '<a class="student-badge badge badge-pill badge-Spch px-2 mb-2 text-decoration-none" href="/RelatedServices/Student/StudentDetail?StudentId='
                                    + row.StudentId + '" target="_blank" title="Speech (' + row.SpecialEdCode + ' - ' + row.SpecialEdDescription + ')">Spch</a>';
                            } else {
                                badges += '<span class="student-badge badge badge-pill badge-Spch px-2 mb-2 text-decoration-none cursor-default" title="Speech (' + row.SpecialEdCode
                                    + ' - ' + row.SpecialEdDescription + ')">Spch</span>';
                            }
                        }
                        return badges;
                    }
                    return data
                })
            }
        ],
        dom: '<"#table-info-row.w-100 d-flex justify-content-start"i>tr',
        fixedHeader: true,
        drawCallback: ((settings) => {
            var api = new $.fn.dataTable.Api(settings);
            if (api.data().any()) {
                $('#table-info-row #results-table_info, #table-info-row .dt-buttons, #results-table thead').show();
            } else {
                $('#table-info-row #results-table_info, #table-info-row .dt-buttons, #results-table thead').hide();
            }
        }),
        info: true,
        language: {
            emptyTable: NoResultsHtmlGet(),
            info: '_TOTAL_ Records Total',
            loadingRecords: '&nbsp;',
            processing: LoadingIndicatorHtmlGet(),
            thousands: ',',
            zeroRecords: '&nbsp;'
        },
        ordering: true,
        order: [[0, 'asc']],
        paging: false,
        processing: true,
        searching: false
    });

    $('#update-results').click(() => {
        table.clear().draw();
        //$('#table-info-row #results-table_info, .dataTables_empty, #table-info-row .dt-buttons')
        //    .hide();
        table.ajax.reload();//.draw();
        $('#btn-search-collapse').removeClass('d-none');
        $('#search-filters').addClass('d-none');
    });