[00:37:13] <wm-bb>	 <gtisza> Yes. Pre-save transform (where subst: gets handled) happens right before save, not when the editor is loaded. (re @Susannaanas: I could add a new question to make that animation scroll away:
[00:37:14] <wm-bb>	 <gtisza> 
[00:37:16] <wm-bb>	 <gtisza> Is it possible to preload to a new page a template that includes...)
[07:02:36] <wm-bb>	 <Susannaanas> Thank you. Would you be ok to have a look at the chain of code to see how I should do it? I can DM, if ok.
[21:40:11] <wm-bb>	 <gtisza> Use the preload= URL parameter. See https://www.mediawiki.org/wiki/Manual:Creating_pages_with_preloaded_text A random example of how to handle subst: in the preloaded page is https://en.wikipedia.org/wiki/Template:AfC_preload/redirect (re @Susannaanas: Thank you. Would you be ok to have a look at the chain of code to see how I should do it? I can DM, if ok.)