Referencing concatenated js

[hex64dbg]

I renamed index.html to index.php, and in project.properties I added :

file.root.page = index.php

The build finishes succefully, but the index.php in the publish folder contains :

<!-- //-beg- concat_js -->
<script src="js/plugins.js"></script>
<script src="js/main.js"></script>
<script src="js/login.js"></script>
<!-- //-end- concat_js -->

Instead of :

<script src="js/5ebd021.js"></script>

I don't have this issue if I delete file.root.page and rename the file back to index.html