I’ve experienced this on multiple sites now. I add in Raw Content, and none of it shows up.
In this case, I’m trying to get the Google 3d model viewer to embed:
I tried putting this in functions.php of the child theme:
<script type="module" src="https://unpkg.com/@google/model-viewer/dist/model-viewer.min.js"></script>
And this in the raw content box:
<model-viewer alt="A Sample Hodly" width-"100%" height="100%" src="/wp-content/uploads/95.glb" ar ar-modes="webxr scene-viewer quick-look" environment-image="" poster="/wp-content/uploads/0095.png" seamless-poster shadow-intensity="1" camera-controls enable-pan></model-viewer>
And it just disappears when I inspect the page… there’s nothing at all in the column. This happens as text, as Raw Content, and everything else I’ve tried.