I've done a git annex add and git commit on my annex which included some files I don't want to add to the annex. I've tried to reverse it all out, but whenever I git annex add something, the unwanted files show up in the git-annex branch.

git init forgetmenot
cd forgetmenot
git commit -m "create" --allow-empty
git annex init fmn

echo 'foo' > foo
echo 'bar' > bar

git annex add
git commit -m "add foo"

git log --oneline --name-only
# 28634c0 add foo
# bar
# foo
# 4a87050 create

git log --oneline --name-only git-annex
74e6969 update
41d/a26/SHA256E-s4--b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c.log
a70/4a5/SHA256E-s4--7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730.log
95285ed update
uuid.log
2135e07 branch created

If you now try to get git-annex to forget by reverting master and git-annex and only adding/commiting foo, the master branch ends up correct, but git-annex magically remembers bar!

git reset --hard HEAD^
git branch -f git-annex git-annex^

echo 'foo' > foo
git annex add
git commit -m "add foo"

git log --oneline --name-only
# 1b4889e add foo
# foo
# 4a87050 create

git log --oneline --name-only git-annex
# 3d0b9bc update
# 41d/a26/SHA256E-s4--b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c.log
# a70/4a5/SHA256E-s4--7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730.log
# 2e17a19 update
# uuid.log
# 646776b branch created

How is git-annex remembering this and how can I get it to completely forget?

I have tried git gc --aggressive --prune=all, git annex fsck --all and git annex drop unused but somehow, git-annex is remembering bar existed.

This is an exercise in micro-managing the git-annex branch a bit, but this situation does also cause git-annex to complain about the missing files on fsck (0 out of 2 copies) so it isn't just being a control freak! Honest!