Do not use DateTimeImmutable.

Entity/Person.php

@@ -22,6 +22,7 @@ namespace Chill\PersonBundle\Entity;
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+use ArrayIterator;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
 use Chill\MainBundle\Entity\Country;
 use Chill\PersonBundle\Entity\MaritalStatus;
@@ -29,9 +30,7 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Chill\MainBundle\Entity\HasCenterInterface;
 use Chill\MainBundle\Entity\Address;
 use DateTime;
-use DateTimeImmutable;
 use Doctrine\Common\Collections\Criteria;
-use Symfony\Component\VarDumper\VarDumper;
 
 /**
  * Person
@@ -128,14 +127,14 @@ class Person implements HasCenterInterface {
      */
     private $fullnameCanonical;
 
-    public function __construct(\DateTimeImmutable $opening = null) {
+    public function __construct(\DateTime $opening = null) {
         $this->accompanyingPeriods = new ArrayCollection();
         $this->spokenLanguages = new ArrayCollection();
         $this->addresses = new ArrayCollection();
         $this->altNames = new ArrayCollection();
 
         if ($opening === null) {
-            $opening = new \DateTimeImmutable();
+            $opening = new \DateTime();
         }
 
         $this->open(new AccompanyingPeriod($opening));
@@ -747,18 +746,17 @@ class Person implements HasCenterInterface {
     /**
      * By default, the addresses are ordered by date, descending (the most
      * recent first)
-     *
-     * @return ArrayCollection
      */
     public function getAddresses(): ArrayCollection
     {
         return $this->addresses;
     }
 
-    public function getLastAddress(?DateTimeImmutable $from = null): ?Address
+    public function getLastAddress(DateTime $from = null)
     {
-        $from ??= new DateTimeImmutable('now');
+        $from ??= new DateTime('now');
 
+        /** @var ArrayIterator $addressesIterator */
         $addressesIterator = $this->getAddresses()
             ->filter(static fn (Address $address): bool => $address->getValidFrom() <= $from)
             ->getIterator();