Thread:WKPQ/@comment-34918040-20190509011925/@comment-34918040-20190509040604

The Rename subpages box is for other subpages (like the /doc, /sandbox and /testcases subpages for templates). The first checkbox is for the comments ("Talk page"), I had overlooked that.

When I reverted my test page renaming, the (first) Talk page checkbox was unchecked. I checked it, and the comments went with the page.