It is not possible to edit a web content article, which belongs to a structure if resources-web-importer is deployed and the content includes an unicode line separator character (U+2028)
Steps to reproduce
1.- Be sure resources-web-importer plugin is deployed. If does not, deploy it.
2.- Create a web content structure with a text field.
3.- Create a template, and choose the previous structure.
4.- Create a web content article, with the previous structure and template, and includes in the text field, at least, one line separator (U+2028). Publish the web content article.
5.- Try to edit the same web content article.
You can edit the web content