Merge branch '4.x' of https://github.com/craftcms/cms into 5.x

# Conflicts:
#	CHANGELOG.md

Author: brandonkelly

CHANGELOG.md

@@ -5,6 +5,7 @@
 - The control panel is now translated into Greek. ([#18458](https://github.com/craftcms/cms/pull/18458))
 - The `PDO::MYSQL_ATTR_MULTI_STATEMENTS` attribute is now set to `false` by default for database connections.
 - Fixed a bug where `searchindex` and `searchindexqueue` rows weren’t being deleted when an element was deleted for a site. ([#18394](https://github.com/craftcms/cms/issues/18394))
+- Fixed a bug where multi-select condition rules weren’t applying their “has a value” and “is empty” operators correctly. ([#18470](https://github.com/craftcms/cms/pull/18470))
 - Fixed an unintended change in behavior where `craft\helpers\App::parseEnv()` was returning `null` instad of an empty string, when an environment variable name was passed in, which was set to an empty string.
 - Fixed a bug where drafts within “My Drafts” widgets weren’t getting hyperlinked. ([#18456](https://github.com/craftcms/cms/issues/18456))
 - Fixed a bug where nested entries were getting assigned new IDs if they were edited multiple times for the same owner element draft. ([#18461](https://github.com/craftcms/cms/issues/18461))

src/base/conditions/BaseMultiSelectConditionRule.php

@@ -181,6 +181,13 @@ protected function paramValue(?callable $normalizeValue = null): string|array|nu
      */
     protected function matchValue(array|string|null $value): bool
     {
+        if (in_array($this->operator, [self::OPERATOR_EMPTY, self::OPERATOR_NOT_EMPTY])) {
+            return match ($this->operator) {
+                self::OPERATOR_EMPTY => empty($value),
+                self::OPERATOR_NOT_EMPTY => !empty($value),
+            };
+        }
+        
         if (!$this->_values) {
             return true;
         }
@@ -194,8 +201,6 @@ protected function matchValue(array|string|null $value): bool
         return match ($this->operator) {
             self::OPERATOR_IN => !empty(array_intersect($value, $this->_values)),
             self::OPERATOR_NOT_IN => empty(array_intersect($value, $this->_values)),
-            self::OPERATOR_NOT_EMPTY => !empty($value),
-            self::OPERATOR_EMPTY => empty($value),
             default => throw new InvalidConfigException("Invalid operator: $this->operator"),
         };
     }