I have a commit history like this:

I want to drop merge commit 8726368d21 and green commits 3228a6f726 and f822e16ac6. I also want to fixup commit 0ef75b0f21.
I ran interactive rebase and configured it like this:

Unfortunately, I get this error:

Then I tried to do the same thing using git bash:

The first thing you might notice is that the merge commit is missing from the list. If I understand correctly, git automatically drops it.
After closing the text editor I get the expected result: