Yellow lifeforce boss in harvest still unkillable and bugged (since 3 years)

The yellow lifeforce -harvest boss (highest tier, unique) still gets stuck 30% of the time in the intermission phase where he just summons adds and remains unkillable. waiting for over an hour and still stuck, even left the area and restarted the game.

please, for the love of god... fix this bug. been live for 3 years now.