I have run into an issue with the addon Wyvern where the field in the publish/edit pages doesn't display as described in this support ticket: https://boldminded.com/support/ticket/773
I figured my best option to resolve the issue is to follow the first response and reinstall Wyvern:
You might have to set all your Wyvern fields to textarea, uninstall, then reinstall Wyvern and assign the fields back to Wyvern.
But before I do that I want to be sure that this process is safe. It would mean converting about a dozen fields to Textarea (Rich Text) and back. Would changing the filetype strip out anything that might be unique to Wyvern, or would it just leave the source code intact until Wyvern was reinstalled?