So how to disable the sanitizing for just this field without breaking the default?
It turns out to be so simple, there's an Advanced tab on the settings for the custom textarea field where you can add an Attribute. The "sanitize_callback" with the value "none" is one such Attribute. So that's really all you have to do.
No longer do I need to edit the sanitizer.php file and comment out the textarea field on line 89 everytime the metabox plugin gets updated!
I used to have to comment out line #89 in the plugin sanitizer.php file every time the Metabox plugin got updated :-(
Below is a short video from Anh Tran the metabox.io developer made showing how to set the textarea custom field attribute "sanitize_callback" to "none"
20 March, 2020 - Loom Recording — Watch Video
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