If you really want to prevent filtering, then the first argument to the_content should be an empty string rather than false. The only valid thing to pass in is a string or a null. Anything else is not guaranteed to have the behavior you want. I tend to believe that this was not your intention since I see in the past you have suggested using the the_content_more_link filter.
https://wpshowposts.com/support/topic/displaying-read-more-button-with-read-more-tag/