Content refresh fails after adding new perspective to the CMS

Hi all,

We are currently using the version 12.6.8 of the Bloomreach CMS.

We’ve added a new perspective to the CMS which creates a report based on two document types.
After opening a document which has a TwoColumn design, if we refresh the page with the document opened we are getting an error 500 response on the page.

The problem is only showing when the new perspective is added to the CMS.

Bellow are the logs outputs: 
[INFO] [talledLocalContainer] 04.03.2020 11:29:26 ERROR http-nio-8080-exec-8 [DefaultExceptionMapper.mapUnexpectedExceptions:170] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.markup.MarkupException: jar:file:/C:/workspace/wa-hippo/target/tomcat8x/webapps/cms/WEB-INF/lib/hippo-cms-editor-frontend-5.6.8.jar!/org/hippoecm/frontend/editor/layout/TwoColumn.html: Error while reading the markup: zip file closed
[INFO] [talledLocalContainer] Caused by: java.lang.IllegalStateException: zip file closed