When the user review API via Apicurio, makes some changes (and accidently makes some mistake) which results in the error, when they save it, there is no review page with the error in Syndesis as before (AR15),
but the UI is gotten back to the first step with only modal dialog error.
So all changes, which were made in Apicurio, are gone and the user needs to import API and do changes again. In AR15, the user just click on Review and correct the mistake in Apicurio.
This is probably the side effect of this issue: https://issues.redhat.com/browse/ENTESB-14078