Question: How to find the commits in the ancestry path of seen down to _and_ including a given topic?

A simple question that I'm spinning out of [1]: How can I get `git
log` to show the commits in the ancestry path from seen, back to *and
including* a given topic (but not commits from unrelated topics)?

   git log --ancestry-path $TOPIC..seen

doesn't work, because that excludes $TOPIC.  (It does get me the merge
of $TOPIC into seen, as well as all merges into seen following that
merge, which I want, but it's missing the topic itself.)

  git log --ancestry-path $BASE_OF_TOPIC..seen

usually doesn't work, because $BASE_OF_TOPIC is usually a commit from
"main" or "master", and this results in pulling in hundreds of commits
from unrelated topics that also happen to be based on a version of
"main" or "master" at or after $BASE_OF_TOPIC.

Is there some magic that does what I want, or is this just not
possible currently?

Thanks,
Elijah


[1] https://lore.kernel.org/git/CABPp-BHARfYcsEM7Daeb7+vYxeB9Awo8=qbrOMXG6BQ0gX1RiA@mail.gmail.com/ (local)