Office documents imported in the WYSIWYG editor sometimes fail to render properly

This is because the office importer generates pages in xwiki/2.0 syntax.

When you use the WYSIWYG office import feature, it adds the generated content to the current page being edited (which will be in xwiki/2.1 syntax if you just created it for example) and thus the xwiki/2.0 content is being rendered as xwiki/2.1 content, hence the potential issues.

The simplest solution is for the WYSIWYG editor's import feature to get the XDOM from the office importer and to render it using a Block Renderer matching the current page's syntax.