Regression: Commit count for push events includes all commits on branch

Summary

The "Activity" pages in GitLab show messages like <user> pushed to branch <branch> <commit> ... and <count> more commits. Since a few days, the <count> seems to include all commits on that branch, although only one or a few new commits were pushed. This happens for all our projects, both on my personal activity page as well as on the project-specific activity page.

Steps to reproduce

Go to an "Activity" page, for example for gitlab-ce.

What is the current bug behavior?

Commit count seems to include all commits in that branch.

What is the expected correct behavior?

Commit count should include only newly pushed commits (as previously).

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com