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You didn’t break anythin, it’s just two different systems in PS9.

• /themes/ZOneTheme/mails/fr/*.html/.txt = legacy “raw” emails (old system).
• BO preview URLs like .../mail_theme/preview/... = Twig email themes, loaded from /mails/themes/<theme>/.

In your screenshot, ZOneTheme only shows index for ps_specials because BO is only finding a module raw template there — you don’t have a real Twig mail theme generated for ZOneTheme, so it can’t list/order-preview order_conf, order_ship, etc.

What you should do:

• Create the Twig mail theme folder:
  • easiest: copy /mails/themes/classic → /mails/themes/ZOneTheme (or BO → Design → Email theme → select ZOneTheme → Generate with overwrite = YES)
• Clear cache: delete /var/cache/*
• Now edit the actual Twig email body, not .txt/.html: /mails/themes/ZOneTheme/templates/... (order confirmation template)

After that, the preview should match your edits.