AEM 6.5.11 guideContainer.submit.jsp returns 404
Hello, I've just upgraded from AEM 6.3 to 6.5.11 and am seeing an issue with our forms. Currently when submitting any of our forms I am seeing an initial success call from /jcr:content/guideContainer.af.internalsubmit.jsp but afterwards when it tries to call /jcr:content/guideContainer.af.submit.jsp, it returns a 404 with no visible error entries in the error.log. Can anyone help me figure out why this might be happening?
I've only been able to find one other question/answer to similar to this (https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/form-is-not-getting-submitted-in-dispatcher/m-p/193104), but that involves updates to dispatcher which we currently do not use as we use a 3rd party CDN provider.
My initial thought was a namespace mangling issue but it was noted that this is enabled by default so the jcr:content bit may not be the issue here. Any responses is greatly apprecieated
