Linking of a derived file that was a project file

I accidentally added a .o file to a project.
In a later change, I aerm'd it.
This .o file is now a derived file.

Whenever I create a new change, a
symlink for that .o file _is_ included in the symlink
farm.  But then when I do the first aeb, the
symlink for that .o file is _removed_ before
the build_command is invoked.

Not a disaster, but mildly annoying.
Do I have to keep paying for my mistake for
ever after?

Using: Aegis version 4.24.D004
(Issue already addressed in 4.25?)

development_directory_style = {
  source_file_symlink = true;
  derived_file_symlink = true;
};

link_integration_directory = false;