How to revert back to Text-Only Article/Book Titles OJS 3.4

Describe the issue or problem

Due to the copy-paste habit of writers and secretaries, a large number of incorrect HTML headings are entered. Unfortunately, these HTML-enriched titles are saved to Crossref metadata during DOI registration, and BOOK DOI records cannot be updated later.

Steps I took leading up to the issue
For example:

  1. Go to a ‘Submission’, Click
  2. Click on 'Title and Summary link. ’
  3. Scroll down to ‘Article Title’, the article title displays bold, italic, well & nice but;
  4. Go to DOIs tab, and see that, article & book titles were registered with HTML codes such as <span> etc.
  5. This might not be a major problem for articles, but since book DOIs are registered along with its ISBN number, Crossref does not permit to be updated via registration plugin later.

How can I totaly disable such kind of HTML code in titles. Even I removed all html code from the allowed html tags section for titles in Config.inc.php, It is still in effect. Is there anything else I should do?

; Allowed HTML tags for submission titles only
; Unspecified attributes will be stripped.
allowed_title_html = ""

What application are you using?
For example, OJS 3.4.0-X & OMP 3.4.0.5

Additional information
Please add any screenshots, logs or other information we can use to investigate this problem.