Difference in mocks generated in github actions

[camaeel]

Actual behavior A clear and concise description of what the bug is.

I'm trying to mock Page interface of playwright-go module.

I have example "demo" application here: https://github.com/camaeel/gomock-issue
I run locally (x86_64 macOs 15, with go1.23.4, but also tried in docker container with ubuntu):

mockgen -destination=./mocks/mock_playwright_page.go -package=mocks -imports playwright=github.com/playwright-community/playwright-go github.com/playwright-community/playwright-go Page

and commited into the repo outcome file.
Then I run the same command in github actions, and it shows differences in the mocks generated in github actions pipeline here: https://github.com/camaeel/gomock-issue/actions/runs/12726641995/job/35475249456#step:5:76

Expected behavior A clear and concise description of what you expected to
happen.

Generated mocks should be exactly the same when generated from the same Interface version and with same mockgen version.

To Reproduce Steps to reproduce the behavior

1. fork repo: https://github.com/camaeel/gomock-issue
2. trigger action (push anything to master branch)
3. run the same command locally

Additional Information

• gomock mode (reflect or source): package mode ?
• gomock version or git ref: v0.5.0
• golang version: go1.23.4

Triage Notes for the Maintainers