In my admin panel I have defined my language as "English",
but in my site I have defined the language as "Spanish".
When I click (on backend) the index button, it only updates the json for the english version, but not the spanish version (nor the other installed languages), so the frontend doesn’t have an updated version.
When I change the language of the site (frontend) to english, everything is working fine.
I tried to execute the cron version and the same happens.
It seems like it doesn’t recognize other languages that are not the default language.