In solving T206274 we dropped use of the ChangesListSpecialPageQuery hook.
The fix went into 1.32.0-wmf.26 which is now live on all wikis.
We should look to remove the feature flag and possibility of running this hook that was added in https://gerrit.wikimedia.org/r/464870
Jon will own verifying this and turning this into the follow up task (if needed).
- Are there any issues in the logs related to this issue?
- Have any bugs been raised in phabricator or village pumps relating to Special:Contributions on mobile?
- A task exists that details the next step.