how to disable change post

hi friends.
i use wp 4.7.

when i save (publish) a post , editor change post text :

i write it:
<!---mycomments--->

editor change it to :

<p><!—mycomments—></p>.

how to disable it.
i use tiny editor and tinymce advance.
* i don’t want to disable <p> and <br />.

i want when i write :
“<!—mycomments—>”
it save as : “<!—mycomments—>”
not “<p><!—mycomments—></p>”

* sory i can’t speak EN good.

• This topic was modified 8 years, 2 months ago by hosseintv.
• This topic was modified 8 years, 2 months ago by hosseintv.
• This topic was modified 8 years, 2 months ago by Jan Dembowski.