Allegedly, on or about 21 March 2018, Ed Greshko sent:
Anyway, I've since determined that the directory name 7725dfc225d14958a625ddaaaea5962b is derived from the contents of /etc/machine-id
For what it's worth, I have a collection of those empty directories on my older installation (FC26), and two sets because I changed a motherboard. The bizarre conglomeration of directories made no sense, to me, until your comment, above.
https://paste.fedoraproject.org/paste/SZkbx0H8W09msV5jVjpliw
But it strikes me, though, are these empty directories something that ought to get erased once the kernel has been installed? Is there any point to them being there.