Merge branch '344676-bug-investigate-diff-issues-in-production' into 'master'

Resolve "[BUG] Investigate diff issues in production"

See merge request gitlab-org/gitlab!73732

lib/gitlab/diff/file.rb

@@ -44,7 +44,7 @@ module Gitlab
         new_blob_lazy
         old_blob_lazy
 
-        preprocess_before_diff(diff) if Feature.enabled?(:jupyter_clean_diffs, @project)
+        preprocess_before_diff(diff) if Feature.enabled?(:jupyter_clean_diffs, repository.project)
       end
 
       def position(position_marker, position_type: :text)