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I currently have two templates, one of which is page.html.twig, which is the main page and I can preprocess with MYTHEME_preprocess_page(). MYTHEME_preprocess_page() affects all the other pages in different modules.

The other template is _carousel.html.twig (theme/templates/includes/_carousel), which I include into page.html.twig, but I cannot hook into it with MYTHEME_preprocess__carousel().

Is this the default behavior, or am I missing something?

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    Yes, preprocess_page affects all pages, because that is the rendering stack. HTML, Page, Region, blocks, etc. Its hard to tell what you are trying to do here without more information.
    – Kevin
    Sep 21, 2022 at 17:18
  • @Kevin I guess the question is why MYTHEME_preprocess__carousel() cannot be used for a template file that is included into another template file.
    – apaderno
    Sep 21, 2022 at 20:51
  • Hey @Kevin, sorry for not answering earlier. What i'm trying to do is more of a reusable component approach. Since i need the same carousel on another page, I want to fetch the data only when it's included, not on every page.
    – murko233
    Sep 22, 2022 at 11:52

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hook_preprocess_page() is invoked for every page Drupal renders. That's why it needs to check for which page is invoked, if it really needs to preprocess specific pages.
A preprocess hook isn't invoked for template files that are included from other template files.

For both the cases, the answer is yes, that is default, expected behavior.

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