Group Membership Loader has accessCheck(true)

Adding some errors with access checks on D10. Sorry if unrelated, but just in case these mean anything to you. I get these errors in various many places.

1. Warning: Undefined array key "group" in Drupal\group\Entity\Access\GroupRelationshipAccessControlHandler->checkCreateAccess() (line 61 of modules/contrib/group/src/Entity/Access/GroupRelationshipAccessControlHandler.php). 
2. TypeError: Drupal\group\Plugin\Group\RelationHandler\GroupMembershipAccessControl::relationshipCreateAccess(): Argument #1 ($group) must be of type Drupal\group\Entity\GroupInterface, null given, called in web/modules/contrib/group/src/Entity/Access/GroupRelationshipAccessControlHandler.php on line 61 in Drupal\group\Plugin\Group\RelationHandler\GroupMembershipAccessControl->relationshipCreateAccess() (line 90 of modules/contrib/group/src/Plugin/Group/RelationHandler/AccessControlTrait.php). 

Hmm dammit, just combed over all changes manually again to double-check and will tag new release.

Re #3: please open a separate issue.

Already committing and releasing fix, but leaving issue open for adding test coverage.

The issue and the error messages mentioned in comment #3 are still exists in
drupal/core: 11.3.2
drupal/group: 3.3.5

In case somebody lands here, because of searching for a solution for error messages in comment #3.
The problem is that group and entity_clone modules aren't friends.

drupal/core: 11.3.2
drupal/group: 3.3.5
drupal/entity_clone: 2.1.0-beta1

1. Go to /admin/config/system/entity-clone/clonable-entities
2. Uncheck the checkbox for Group relationship
3. This solved the problem on page: /group/1/content