This indeed looks like a dupe of
https://bugzilla.redhat.com/show_bug.cgi?id=1936422 which #1684 was attempting
to fix. The actual, real transaction (assuming that a `%pretrans` scriptlet
removing the old symlink is present) does the right thing, this is just about
the *test* transaction (which DNF/YUM perform) where it fails.
A minimal package reproducing the issue:
```
%bcond_with new
Name: symlink
%if %{with new}
Version: 2
%else
Version: 1
%endif
Release: 1%{?dist}
Summary: Symlink conflict test
License: GPL
%description
%{summary}.
%if %{with new}
%pretrans -p <lua>
path = "/opt/symlink/bar"
st = posix.stat(path)
if st and st.type == "link" then
os.remove(path)
end
%endif
%prep
%build
%install
mkdir -p %{buildroot}/opt/symlink/foo
echo hello > %{buildroot}/opt/symlink/foo/blah
%if %{with new}
mkdir -p %{buildroot}/opt/symlink/bar
echo new > %{buildroot}/opt/symlink/bar/blah
%else
ln -s foo %{buildroot}/opt/symlink/bar
%endif
%files
/opt/symlink
```
Usage:
```
$ rpmbuild -bb /path/to/symlink.spec # builds symlink-1-1 package
$ rpmbuild -bb --with new /path/to/symlink.spec # builds symlink-2-1 package
$ rpm -Uhv /path/to/symlink-1-1.rpm
$ rpm -Uhv --test /path/to/symlink-2-1.rpm # this should fail
$ rpm -Uhv /path/to/symlink-2-1.rpm # this should work
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