Go to Video>files and check to make sure this bdmv is setup as a source and try to navigate into it from there to make sure Kodi can actually reach it. You only provided the Kodi log and we can’t see your sources from that.
Otherwise…
Go to Video>files and then context menu on one of your movie sources with missing library items. Select ‘change content’ and change the type from ‘movie’ to ‘none’ and then hit OK. When it asks if you want to remove these items from the library select NO. Context menu on that folder again and select ‘set content’, and then set the type back to ‘movie’ and hit OK. When it asks if you want to rescan to the library select yes. Check the library to see if this makes at least most of the movies show up again.