Isolating router scrambles multiple files

[gr8bit]

I have some locale files I want to sort but individually, so every file separately. Therefore, I have the following config in config/i18n-tasks.yml:

base_locale: en
data:
  read:
    - config/locales/%{locale}.yml
    - config/locales/*.%{locale}.yml
    - config_tenants/locales/*.%{locale}.*.yml
  router: isolating_router

When I execute

i18n-tasks normalize

it moves translations around in these files, leaving some almost empty and others with most of the translations even from other files. This should not happen as I'm using the isolating_router.
Changing the order of the read section changes the outcome a little, but it's still wrong in the same way.