Change iframe src without adding history entry

I have an iframe that’s rendering some content. I want to programmatically change the iframe’s src attribute. However I don’t want this change to affect the browser’s history.

My initial attempt is this, but this is causing the browser (Firefox) to add history entries when changing the src:

    get previewUrl(): SafeString {
        return htmlSafe(`...`);
    }

    <iframe src={{this.previewUrl}} />

See also something this question from 2 decades ago: javascript - Reload an IFRAME without adding to the history - Stack Overflow

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