I've fought this boss 10~15 times in my first play, but with 4 energy bars collected, no glitch, I'll play it again and check if it's a "5 energy stones" glitch, and I was tp before the entrance, but I was below ground collision box and it counted as defeating the boss, I've received the congrats(with my little knowledge of coding) perhaps the bug is that if one overlaps the other theres a bug, but I'll test again in the same conditions (before talking to the first villager illusion (I've never made until the second illusion because I had to shut down the pc at the only moment I reached 2nd illusion chat)