Comment 24 for bug 2055239

Thanks for all the investigation and discussion!

Just to close out the ubuntu-pro-client related questions:
ubuntu-pro-client does run daemon-reload in postinst.
and here is a reproducer that doesn't involve ubuntu-pro-client services

```
lxc launch ubuntu-daily:noble test
lxc shell test
# now in the noble container
cat > /usr/lib/systemd/system/hello.service << EOF
[Unit]
Description=Hello

[Service]
Type=oneshot
ExecStart=echo hello
EOF
systemctl start hello
systemctl status hello
snap install snapd
systemctl start hello # this will show the warning
systemctl cat hello.service # no noticeable change
```

So I'll mark this invalid for u-a-t.

This also demonstrates that a totally new systemd service is affected. Does snapd iterate over all systemd units to check something? Then maybe it is accidentally updating mtime even though it doesn't change contents?