SharePoint Online: Client libraries not loaded in publishing pages

Recently worked with a customer who had JSOM code in a content editor web part.  They had this web part deployed to a page on their SharePoint Online publishing site.  For simplicity, let’s say they had the below code in a JS file referenced in their content editor web part. <script type="text/javascript">   ExecuteOrDelayUntilScriptLoaded(spCallOut, ‘SP.js’);…

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