ABOMINATION REVEALED AT LAST
Error message
User warning: Trying to overwrite a cache redirect for "entity_view:block:mahipro_site_branding:[languages:language_interface]=en:[theme]=mahipro:[user.permissions]=d4b88cc779e0ae598e524b2b7df067fc51837a20de135a5073b0b39306e49eac" with one that has nothing in common, old one at address "languages:language_interface, theme, user.permissions" was pointing to "url.query_args:language", new one points to "languages:language_url". in Drupal\Core\Cache\VariationCache->set() (line 238 of core/lib/Drupal/Core/Cache/VariationCache.php).
