maven invetion 10 bosses

the maven 10 boss invetion isn't completing for me and im not getting the 5th scarab slot.

ran it twice so I killed 20 bosses total, and its not completing

I even removed the voidstone and did all the 14+ tier maps that are 14 and above naturally and still didn't work

I'm having the same problem here, everything has been completed multiple times, and it still won't release.

ok thanks to zizaran!
he posted a video about the new atlas and explain at 8:45 how to unlock the 5th slot.

leaving a link here https://www.youtube.com/watch?v=vm1wKHTbOeo

Long story short, the last slot is unlocked by completing a nightmare map. Maven 10 way is just the 4th slot.

This is still a bug imo, as with Maven 10 way unlock completed, it shows the Maven 10 way as completion requirement for slot 5 instead of the nightmare map, as it is shown when no additional slots are unlocked.