Scrollbar Not Always Visible in Firefox for a Div When Idle

I have a div that contains a scrollbar, and it works fine in most browsers. The scrollbar is always visible in Chrome, Opera, and Internet Explorer. However, in Firefox, the scrollbar disappears when the content is idle, and I need it to always remain visible.

Below I added my CSS styles for my DIV
CSS

.transcript-container {
    max-height: 250px;
    overflow-y: auto;  /* I want the scrollbar to always be visible */
    padding: 15px;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    margin-top: 15px;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5rem;
    border-radius: 8px;
    text-align: justify;
}

I’ve tested this across different browsers:

Chrome: Always visible
Opera: Always visible
Internet Explorer: Always visible
Firefox: Scrollbar disappears when content is idle
How can I ensure that the scrollbar remains visible in Firefox even when the content is idle?

Any help would be appreciated!

Scroll bar is not visible
Scroll bar is visible

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