* [#4533] Fixed Objects API registration options checkboxes not toggling.
* [#4516] Fixed imports (and error feedback) of legacy exports with Objects
  API registration backends. It should now be more clear that admins possibly need to
  check the Objects API groups configuration.
* [#4191] Fixed the datatype of ``vestiging`` field in ZGW registration
  rollen/betrokkenen.
* [#4334] Fixed the email registration plugin not sending a payment-received
  email when "wait for payment to register" is enabled. This behaviour is to ensure that
  financial departments can always be informed of payment administration.
* [#4502] Fixed a problem where the registration-backend routing logic is not
  calculated again after pausing and resuming a submission.
* [#4560] Fixed more PDF generation overlapping content issues. The layout no
  longer uses two columns, but just stacks the labels and answers below each other since
  a compromise was not feasible.
* [#4519] Fixed form variable dropdowns taking up too much horizontal space.
* Backend checks of form component validation configuration are mandatory. All components
  support the same set of validation mechanism in frontend and backend.