Simulacrum Wave 16/15 cannot start it, got no loot from finishing

I encountered an issue with my new build while running the Simulacrum. After completing the encounter, the game still indicated that 4 monsters remained, although none were present. Additionally, the display showed Wave 16/15, preventing me from starting the wave.

Another issue occurred with the boss: it teleported out of the arena to my Primates (from Rite of Passage), and I had to wait for about one minute until they killed it.

Bug Report ID: 2.483.363.527

BR