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Okay this is interesting…it’s missing on Foundation on your site again Moin, even though it’s enabled in the admin UI. Clearing the cache with SiteSetting.clear_cache!(expire_theme_site_setting_cache: true) is not clearing the cache. I get two different results here:

discourse(prod)> SiteSetting.theme_site_settings_json_uncached(-1)
=> "{\"enable_welcome_banner\":true,\"search_experience\":\"search_field\"}"
discourse(prod)> SiteSetting.theme_site_settings_json(-1)
=> "{\"enable_welcome_banner\":false,\"search_experience\":\"search_field\"}"

And then I just ran this directly:

Discourse.cache.delete(SiteSettingExtension.theme_site_settings_cache_key(-1))

And it worked?? Then I changed your setting again in admin and the cache is persisting :thinking: I think something weird is happening with the theme_site_settings in memory here:

Because that is giving:

 -2=>{:enable_welcome_banner=>false, :search_experience=>"search_field"},
 -1=>{:enable_welcome_banner=>true, :search_experience=>"search_field"}}

Whereas if I fetch from the DB, I get this, which has the proper false value:

ThemeSiteSetting.where(theme_id: -1)
=>
[#<ThemeSiteSetting:0x00007f9164acb2d0 id: 3, theme_id: -1, name: "enable_welcome_banner", data_type: 5, value: "f", created_at: "2025-07-16 07:04:11.117747000 +0000", updated_at: "2025-08-11 06:35:07.606301000 +0000">,
 #<ThemeSiteSetting:0x00007f9164acb190 id: 13, theme_id: -1, name: "search_experience", data_type: 7, value: "search_field", created_at: "2025-07-16 07:04:11.117747000 +0000", updated_at: "2025-07-20 20:56:49.405228000 +0000">]
discourse(prod)> Theme.find(-1).themeable_site_settings
=>
[{:setting=>:enable_welcome_banner, :default=>true, :description=>"Display a banner on your main topic list pages to welcome members and allow them to search site content", :humanized_name=>"Enable welcome banner", :type=>"bool", :value=>false},
 {:setting=>:search_experience,
  :default=>"search_icon",
  :description=>"The default position and appearance of search on desktop devices",
  :humanized_name=>"Search experience",
  :type=>"enum",
  :valid_values=>[{:name=>"search.experience.search_field", :value=>"search_field"}, {:name=>"search.experience.search_icon", :value=>"search_icon"}],
  :translate_names=>true,
  :value=>"search_field"}]

We fiddle with this here:

And here:

Which is called here:

So I am not sure why this happening yet, but it would explain why the cache is holding on, because the cache is built from this object in memory.

Edit: Also note, I still can’t reproduce this elsewhere, but I can reproduce it quite reliably on your site.

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