TYPO3 Core

TYPO3 version 9.5.3

In UriBuilder->convertDomainObjectsToIdentityArray

there is the following code

if ($argumentValue instanceof \TYPO3\CMS\Extbase\DomainObject\AbstractDomainObject) {
                if ($argumentValue->getUid() !== null) {
                    $arguments[$argumentKey] = $argumentValue->getUid();

as result using actionlink arguments produce a link with the id object instead of the object itself.
Undesired side effect is that is not possible in Extbase to use actions with domain object as parameter pointed by actionLinks as
is done with forms