Welcome to the community and thanks for reporting this! Great first post!
I will report this internally to get it fixed. At the same time, this shouldn’t hold up your upgrade.
Since you’re only hitting 6.7.7 as a pit stop on the road to 7.9, you can upgrade to 6.7.7 Community Edition without adding in the EE package and then move straight on to 7.9. Why will this work? It’s the database migrations that are important here, and they’re the same for all editions.