Don't understand why "Fill in from another locale" is sometimes not available

This is not a good solution for me. Have you tried this with collection types with fields that are non localized? Meaning fields that should be the same for all localization.
In my case, I have a bunch (eg, images that should be shared accross all localizations). So, if I move forward with your suggestion, I end up loosing all values on fields that are not localized, and it’s very frustrating. I’ll expand the steps you outlined:

  • with the content manager go to the content type for which you want to duplicate the content for another language
  • make sure a non-localized field exists on that collection type
  • select the language on the drop down list in the right side
  • click right away on save
    **** Note how you already loosed data on non-localized fields from the original language ****
  • the “fill in from another locale” appears
  • click on it
  • localized fields (the remaining ones) will be copied over to the new language
    —> Conclusion: Data is lost

Anyone experiencing the same? I’m currently on strapi 4.14.4
Thanks