WYSIWYG “Visual to Text” Visibility Hidden

Hello

Recently I noticed that when switching from the visual tab to text in the WYSIWYG editor, an inline CSS style (visibility: hidden;) is added to the text-area element, this makes the element invisible and without possibility of edits.

To fix the problem I’m adding the following CSS line to the backend of the theme:

.wp-editor-container textarea.wp-editor-area { visibility: visible !important; }

As I understand it is the “display: none” that controls the display between the Visual and Text tabs. I don’t know which command is triggering “visibility: hidden;” inline to the element.