Description field Editor difference in Create new Case and Update existing Case

Hi all,

Environment:
Linux/Apache 2.4.x
PHP 7.3
Suitecrm 7.11.12

When I create a new case or edit an existing case from within the Case module, the TinyMCE editor is provided to update the ‘description’ field.

If I create a Case from an inbound email in the Email module, the TinyMCE editor is replaced by a plain text editor. The user wants the Case->description field to be populated with data from a field of the parent email record. This data usually contains HTML and an ordinary text field displays those tags.

l have checked for a custom vardefs file and there is none that would cause this issue.

Any ideas?