this is a regression after applying patch from EZP-22641.

the override setting

[node_line_thumbnail_file]
MatchFile=node/view/line_thumbnail/file.tpl

has wrong path, should be
MatchFile=line_thumbnail/file.tpl

test case:

• in admin backend, use multiupload to upload some files
• check in var/log/error.log the message:

  Custom match file: path 'node/view/line_thumbnail/file.tpl' not found in any resource. Check the template settings in settings/override.ini