API user cannot create CoTAndCAgreementTest

Rest API users cannot create a CoTAndCAgreementTest. A call like

POST /registry/co_t_and_c_agreements.json

with appropriate body and header throws exception

2022-02-11 13:54:21 Error: [ArgumentCountError] Too few arguments to function ApiComponent::checkRestPost(), 0 passed in /srv/comanage-registry/app/Controller/CoTAndCAgreementsController.php on line 87 and exactly 1 expected

and returns a 500.