boss not spawning in Simulacrum

See title. video attached of the bug.

https://youtu.be/nCJMCYOlaBY

I encountered the same issue. The boss spawned when I got out and back in through the portal to hideout.


Edit: Nevermind, it actually bricked the wave after killing the boss. I can't initiate the last wave.

https://youtu.be/x3rlA_29MCA