title: Missing SiteColumn in Document Library
body: <p>I have a Content Type with a number of Site Columns inside it.</p>
  
  <p>I added this content type to a Document Library, however, one of the site columns is not appearing.</p>
  
  <p>I'm using SharePoint on premise - the site columns and content type should have been properly created as it even works fine for some other document libraries.. I only have the problem, with exactly the same content types, in some document libraries... Can it be fixed without having to re-create document library?</p>
  
  <p>I have tried removing and re-adding the column but nothing seems to work. Any ideas?</p>