title: Bug in Liferay's form functionality makes impossible to create forms with more than 28 items
body: <p>There is a bug in the Liferay's forms functionality (I'm using Liferay CE 7.4.32) that makes impossible to have forms with more than 28 items.</p>
  <p>The form only reaches 28 questions before being unable to save new items and triggering the error, as if there was some limit to the number of items that could be added to the form. I also created a completely new form and got the same error when the form reached the same state as the original one:</p>
  <pre><code>2022-09-05 11:31:24.685 ERROR [http-nio-8080-exec-1][PortletServlet:117] null
  javax.portlet.PortletException: java.lang.IllegalStateException: The property &quot;serializedFormContext&quot; is required
      at com.liferay.portal.kernel.portlet.bridges.mvc.BaseTransactionalMVCActionCommand.processAction(BaseTransactionalMVCActionCommand.java:58) ~[portal-kernel.jar:?]
      at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.callActionMethod(MVCPortlet.java:402) ~[portal-kernel.jar:?]
      at com.liferay.portal.kernel.portlet.LiferayPortlet.processAction(LiferayPortlet.java:82) ~[portal-kernel.jar:?]
      at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.processAction(MVCPortlet.java:256) ~[portal-kernel.jar:?]
      at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:77) ~[portal-impl.jar:?]
      at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:50) ~[portal-kernel.jar:?]
      at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:113) ~[portal-kernel.jar:?]
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[servlet-api.jar:4.0.FR]
      at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153) ~[?:?]
      at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62) ~[?:?]
      at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120) ~[?:?]
      at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48) ~[?:?]
  ....
      at java.lang.Thread.run(Thread.java:748) [?:1.8.0_301]
  Caused by: java.lang.IllegalStateException: The property &quot;serializedFormContext&quot; is required
      at com.liferay.dynamic.data.mapping.form.builder.internal.context.DDMFormContextToDDMForm.deserialize(DDMFormContextToDDMForm.java:77) ~[?:?]
      at com.liferay.dynamic.data.mapping.form.builder.internal.context.DDMFormContextToDDMForm.deserialize(DDMFormContextToDDMForm.java:59) ~[?:?]
      at com.liferay.dynamic.data.mapping.form.web.internal.portlet.action.helper.SaveFormInstanceMVCCommandHelper._getDDMForm(SaveFormInstanceMVCCommandHelper.java:222) ~[bundleFile:?]
      at com.liferay.dynamic.data.mapping.form.web.internal.portlet.action.helper.SaveFormInstanceMVCCommandHelper._updateFormInstance(SaveFormInstanceMVCCommandHelper.java:340) ~[bundleFile:?]
      at com.liferay.dynamic.data.mapping.form.web.internal.portlet.action.helper.SaveFormInstanceMVCCommandHelper.saveFormInstance(SaveFormInstanceMVCCommandHelper.java:125) ~[bundleFile:?]
      at com.liferay.dynamic.data.mapping.form.web.internal.portlet.action.SaveFormInstanceMVCActionCommand.doService(SaveFormInstanceMVCActionCommand.java:57) ~[bundleFile:?]
      at com.liferay.dynamic.data.mapping.form.web.internal.portlet.action.SaveFormInstanceMVCActionCommand.doTransactionalCommand(SaveFormInstanceMVCActionCommand.java:84) ~[bundleFile:?]
      at com.liferay.portal.kernel.portlet.bridges.mvc.BaseTransactionalMVCActionCommand$1.call(BaseTransactionalMVCActionCommand.java:44) ~[portal-kernel.jar:?]
      at com.liferay.portal.kernel.portlet.bridges.mvc.BaseTransactionalMVCActionCommand$1.call(BaseTransactionalMVCActionCommand.java:40) ~[portal-kernel.jar:?]
      at com.liferay.portal.spring.transaction.BaseTransactionExecutor.execute(BaseTransactionExecutor.java:37) ~[portal-impl.jar:?]
      at com.liferay.portal.spring.transaction.TransactionInvokerImpl.invoke(TransactionInvokerImpl.java:39) ~[portal-impl.jar:?]
      at com.liferay.portal.kernel.transaction.TransactionInvokerUtil.invoke(TransactionInvokerUtil.java:28) ~[portal-kernel.jar:?]
  </code></pre>
  <p>When the form reaches this &quot;maximum&quot;, if you keep adding questions to the form, the next time you try to save it, Liferay automatically redirects you to the listing of available forms and all your work is lost.</p>
  <p>Does someone know a fix or a workaround for this issue? Any help would be much appreciated.</p>