Looks like this bug hasn’t been fixed:
When having “Format document on save” activated and code like this on the page:
<meta property="og:site_name" content="<?php echo($rsMetaWebsite->getColumnVal("WebsiteTitel_de")); ?>">
Wappler adds a space: … getColumnVal(" WebsiteTitel_de") …
<meta property="og:site_name" content="<?php echo($rsMetaWebsite->getColumnVal(" WebsiteTitel_de")); ?>">
and breaks the code for the page. In this case the page won’t be indexed correctly by Google.