Indeed when using a pipe symbol an error occurs. The problem comes from Sitefinity's link parser which tries to resolve the href value, but it does not find the ending square bracket ']'. I suppose this is due to the value being automatically generated by default and it is not expected users to manually change it.
To fix this you will need to access your project's database and find the table of the problematic content type. For the out of the box static modules those are:
News -> sf_news_items
Blog posts -> sf_blog_posts
Content blocks -> sf_content_items
If you have used Module builder for this module the table should be named with the convention modulename_contenttypename.
In the table find the problematic entry and directly modify the value in the database by closing the attribute with square bracket ']'.
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