External Javascript URL is being stripped out

I was trying to add an external widget that contains <script src=”URL”> tag and a set of initialization methods like <script>widget.Init();</script>.

When I add it using the elementor editor, it works. When I preview it using the preview button it works. But after I save it, it stops working. Console shows widget is not defined error, because the <script src=”URL”> was missing on the actual website. Why elementor is stripping out the external src URL after saving? but not during preview?