Why does ngx-typed-js cursor remain | instead of _ when using [cursorChar]?

I'm using ngx-typed-js to display a typing animation, and I want the cursor to appear as _ instead of |. It seems like the cursorChar property isn't being applied. How can I make the cursor appear as _?

<ngx-typed-js
[strings]="['Full Stack Web Developer']"
[typeSpeed]="70"
[showCursor]="true"
[cursorChar]="'_'"
>
<h1><span class="green typing"></span></h1>
</ngx-typed-js>


However, the cursor is always shown as | . When I inspect the element, this is what i see:

<span class="typed-cursor typed-cursor--blink" aria-hidden="true" style="font-size: 48px; color: rgb(51, 255, 51);">|</span>

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