Bahlak the Sky Seer still occasionally going invisible after tornado during Trials of Chaos

THis has been an issue since 0.1, after its tornado phase, the boss would occasionally stay invisible but continues to attack, making it hard or impossible to see its devastating AoE hits, often leading to death. I personally find it run breaking and extremely unfair (just lost sacrificed currency used with corrupted Ultimatum token, which isn't fun at all).

Can this be prioritized after the holidays? Would really appreciate it!