After upgrading to 1.9.0, the content editor in the admin panel removes the tags in my content. Example:

{{ theme:partial src="youtube" youtubeID="LKdSyGf1feE" }}

That writes to the file and renders just fine. Once I go back to edit the file, the tag is gone from the editor. If I save the file, the entire tag is deleted from the file. I checked settings.yaml and I didn't see anything I might have accidentally changed. I'm assuming it's a bug in the new admin code?

Thanks!!