It may be where items pushed along by the object end up.
I’ve checked intermediate answers following the standard path from 13ac/2dn and the reverse path from 13ac/6dn. On the standard path, we have already noted 24ac (an irregular past tense given in Chambers), and 10dn and 4ac (standard plural forms of real words). However, I can see three real words in the intermediate forms in the reverse path. These are 12ac ( given as an alternative spelling for a more common word beginning with “c”), 16ac (the standard plural of a word meaning a type of bracken), and 14dn (the standard plural of an older form of “pixel”)
So, unless there is an alternative solution that we are currently missing, it looks like the preamble does not strictly work.