Upgraded Drupal core from 9.4.7 to 9.5.8 as well as contrib modules, but upgradation of Site Settings and Labels 8.x-1.19 to 1.20 gave following error. While downgrading this module (only) back to 1.19 would give php warning.
Composer update with dependencies.
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Error: Undefined constant Drupal\site_settings\SiteSettingsLoader::SITE_SETTINGS_CACHE_BIN in Drupal\site_settings\SiteSettingsLoader->loadAll() (line 60 of modules/contrib/site_settings/src/SiteSettingsLoader.php).
Drupal\site_settings\SiteSettingsLoader->loadAll() (Line: 75)
site_settings_preprocess(Array, 'field', Array)
call_user_func_array('site_settings_preprocess', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 433)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array) (Line: 110)
Drupal\Core\Entity\Controller\EntityViewController->buildTitle(Array)
call_user_func_array(Array, Array) (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 788)
Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 374)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 242)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 243)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 132)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 174)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 116)
Drupal\cloudflare\CloudFlareMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)Warning: Undefined variable $cache in Drupal\site_settings\SiteSettingsLoader->loadAll() (line 62 of /var/www/html/web/modules/contrib/site_settings/src/SiteSettingsLoader.php)
#0 /var/www/html/web/core/includes/bootstrap.inc(347): _drupal_error_handler_real(2, 'Undefined varia...', '/var/www/html/w...', 62)
#1 /var/www/html/web/modules/contrib/site_settings/src/SiteSettingsLoader.php(62): _drupal_error_handler(2, 'Undefined varia...', '/var/www/html/w...', 62)
#2 /var/www/html/web/modules/contrib/site_settings/site_settings.module(75): Drupal\site_settings\SiteSettingsLoader->loadAll()
#3 [internal function]: site_settings_preprocess(Array, 'field', Array)
#4 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(287): call_user_func_array('site_settings_p...', Array)
#5 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(433): Drupal\Core\Theme\ThemeManager->render('field', Array)
#6 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(446): Drupal\Core\Render\Renderer->doRender(Array)
#7 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(204): Drupal\Core\Render\Renderer->doRender(Array, false)
#8 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(479): Drupal\Core\Render\Renderer->render(Array)
#9 /var/www/html/web/sites/default/files/php/twig/6450e63288741_paragraph.html.twig_I1mv5pZ60qEdrRw0kouePW1cQ/z7GqUwKde5wcQcCU2Kwk5NryDnd7RyLrIa2QODCXTEQ.php(70): Drupal\Core\Template\TwigExtension->escapeFilter(Object(Drupal\Core\Template\TwigEnvironment), Array, 'html', NULL, true)
#10 /var/www/html/vendor/twig/twig/src/Template.php(182): __TwigTemplate_c625f61593775a36adc529464a39e327e990396b976dc4711a96d7417878e7c4->block_content(Array, Array)
#11 /var/www/html/web/sites/default/files/php/twig/6450e63288741_paragraph.html.twig_I1mv5pZ60qEdrRw0kouePW1cQ/z7GqUwKde5wcQcCU2Kwk5NryDnd7RyLrIa2QODCXTEQ.php(58): Twig\Template->displayBlock('content', Array, Array)Closed: outdated
1.20
Code
Apologies for the delay here - Is this still the case? I don't seem to get this error and the constant is in the class at the top