<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=520680) </details> <!--IssueSummary end--> Merge request default version (the latest one you see when you go to the Changes tab by default) is missing diff context needed for comments on expanded unchanged lines. This context is restored when manually switching MR versions. Example MR: 1. [MR version selected, context lines are present, all diff file threads are visible](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182093/diffs?diff_id=1271194873) 2. [Default MR version, context lines are not present, 2 diff file threads are missing](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182093/diffs)