Expected behavior ngFor loop should run to generate nav items.

Actual behavior ngFor loop causes the item to not display at all.

Resources (screenshots, code snippets etc.)

<mdb-sidenav-layout>
<mdb-sidenav class="bg-dark" #sidenav="mdbSidenav" [hidden]="false"
    scrollContainer="#scroll-container" mode=side color=primary>
    <ul id="scroll-container" mdbScrollbar class="sidenav-menu bg-dark">
        <a #sidenavToggle class="inline-block p-3" [routerLink]="[]" (click)="sidenav.toggleSlim()">
            <i class="fas fa-angle-double-left"></i>
        </a>
        <a class="" slim="false">
            <h3 id="sidenav-header" class="inline-block m-0 py-3 text-light align-middle" slim="false">Examples</h3>
        </a>
        <mdb-sidenav-item>
            <a class="sidenav-link">
                <i class="far fa-smile fa-fw me-3"></i><span slim="false">Link 1</span></a>
        </mdb-sidenav-item>
        <mdb-sidenav-item *ngFor="let category of categories">
            <a class="sidenav-link" [routerLink]="">
                <small slim="false" class="text-uppercase text-light">Category</small>
            </a>
            <ul class="sidenav-collapse" mdbCollapse>
                <li class="sidenav-item">
                    <a class="sidenav-link">Link 2</a>
                </li>
                <li class="sidenav-item">
                    <a class="sidenav-link">Link 3</a>
                </li>
            </ul>
        </mdb-sidenav-item>
        <li class="sidenav-item" *ngFor="let category of categories">
            <div>
                <a class="sidenav-link active" href="/dashboard/832730685940432956">
                    <small slim="false" class="text-uppercase text-light">Category</small>
                    <i class="fas fa-angle-down rotate-icon" style="transform: rotate(180deg);"></i>
                </a>
            </div>

            <ul mdbcollapse="" class="sidenav-collapse collapse show">
                <li class="sidenav-item">
                    <a class="sidenav-link">Link 2</a>
                </li>
                <li class="sidenav-item">
                    <a class="sidenav-link">Link 3</a>
                </li>
            </ul>
        </li>
    </ul>
</mdb-sidenav>
<mdb-sidenav-content #sidenavContent>
    <div class="bg-light text-dark d-flex flex-column min-vh-100">
        <div class="container-fluid">
            <button #sidenavToggle class="btn btn-primary" (click)="sidenav.toggle()">
                <i class="fas fa-bars"></i>
            </button>
            <button #sidenavToggle class="btn btn-primary" (click)="sidenav.toggleSlim()">
                toggle slim
            </button>
        </div>
        <app-footer class="mt-auto"></app-footer>
    </div>
</mdb-sidenav-content>

Is there documentation somewhere that I am missing?