backport removing deactivation

Author: ellatrix

src/wp-includes/block-template-utils.php

@@ -1358,8 +1358,6 @@ function get_block_template( $id, $template_type = 'wp_template' ) {
 					return $template;
 				}
 			}
-		} elseif ( false === $active_templates[ $slug ] ) {
-			return null;
 		}
 	}
 

src/wp-includes/block-template.php

@@ -168,16 +168,6 @@ function resolve_block_template( $template_type, $template_hierarchy, $fallback_
 	$specific_template = $object ? get_page_template_slug( $object ) : null;
 	$active_templates  = (array) get_option( 'active_templates', array() );
 
-	// Remove templates slugs that are deactivated, except if it's the specific
-	// template or index.
-	$slugs = array_filter(
-		$slugs,
-		function ( $slug ) use ( $specific_template, $active_templates ) {
-			$should_ignore = $slug === $specific_template || 'index' === $slug;
-			return $should_ignore || ( ! isset( $active_templates[ $slug ] ) || false !== $active_templates[ $slug ] );
-		}
-	);
-
 	// We expect one template for each slug. Use the active template if it is
 	// set and exists. Otherwise use the static template.
 	$templates       = array();