Unable to see stories on Safari 13 with beta

Giving an update since my stories have refreshed:

The view panel is still blank. Safari 13 looks like the first picture above. Chrome shows everything just fine.

Viewing source on Safari gives this error message: 'd.replaceAll' is undefined, referring to the long line in this function:

    content_preview: function(b, c) {
        var d = this.get(b);
        b && d || (d = this.story_content());
        d = (d = (d = (d = d && d.replace(/<(?:.|\n)*?>/gm, " ")) && Inflector.stripTags(d)) && d.replaceAll("\u00a0\u200c", " ")) && d.replace(/\s+/gm, " ");
        return _.string.prune(_.string.trim(d), c || 150, "...")
    },

That’s because replaceAll() wasn’t added to string in Safari until 13.1! (I use an admittedly obsolete version: 13.0.4.) Is it possible to do something else in your preview function for us luddites?