The changes introduced into r898476 to address
TAP5-979 has introduced the new ValidationTrackerWrapper.
This seems to cause a regression in the way form validation is processed.
The old (and wanted) way is to have onValidate to check for form-wide validations and store into the form (form.recordErorr) any found violation. Then if there are violations (errors recorded) the form fire the onFailure events otherwise go to onSuccess.
With this changes the event path goes always from validate to success events, the failure event is never fired.
The only possible workaround is to have the onFailure event handler method to return an object (typically this) and never be of type void.