Initially, I had 2 branches in the Github repository: developer and master. After I made commits to the developer branch, I did merge (from Pull Requests), and then I tried to mark this merge (by clicking Revert on the Pull Requests tab). Everything seems to be fine, on the Code tab, everything looks as expected - the code in the master branch no longer includes the code made in the specified commits. However, now I can't make a pull request to merge these commits from developer to master:
In this case, when changing the base (after clicking on the link “ switching the base” ), the changes are:
but in this case it is proposed to delete the commit code from developer, i.e. casting the developer branch code to the form of the master branch code, and I need to do the opposite. How can this be done?

