Each editor does notes as he sees it.
The original 1611 does mention "the Church"
I have several reference Bibles that have no heading to Isaiah 52.
Do you demonstrate how that many KJV-only advocates may be uninformed and sometimes misinformed about editions of the KJV?
Perhaps ignoring or avoiding the first three hundred years of KJV editions, many KJV-only advocates may jump to their opinions about editions of the KJV based on post-1900 KJV editions. From all the many editions during the first three hundred years of its existence, a few of them may have seen only a 1611 reprint edition.
Because a claim may be generally accurate concerning post-1900 KJV editions does not mean that it would be accurate and true concerning all pre-1900 KJV editions.
It is not only the original 1611 edition of the KJV that has the chapter headings made by the KJV translators. I have not examined all editions of the KJV printed in London, at Cambridge, and at Oxford during the 1600's, 1700's, and 1800's, but I have likely examined over 200 KJV editions printed during those years. Based on actual examination of many KJV editions printed in the 1600's, 1700's, and 1800's, I can observe that those KJV editions printed in London, at Cambridge, and at Oxford during those years commonly or typically still have the same chapter headings as found in the 1611 edition. Benjamin Blayney in his 1769 Oxford edition of the KJV did make a few changes to the 1611 chapter headings.
Benjamin Blayney noted that “considerable alterations have been made in the Heads or Contents prefixed to the Chapters” in his 1769 Oxford edition (Scrivener,
Authorized Edition, p. 239), and Scrivener maintained that in many cases Blayney gave “a better account of the real contents of the chapters than the old” [1611] did (p. 133). Scrivener asserted that later Oxford editions returned to the headings of the 1611 edition and that Cambridge editions never adopted the changes made by Blayney (p. 133).
The American Bible Society in the mid-1800's also made some changes to the chapter headings from the 1611 edition in their ABS editions.