Derelict Mansion boss not starting BUG

im doing my first juiced map of the league, spent a while clearing maps around it and spent a decent bit on the map craft, only for it to just not start:(

tis the image
https://cdn.discordapp.com/attachments/1087237464734838794/1416837019824296148/image.png?ex=68c84bcd&is=68c6fa4d&hm=bcc5f478c43dc71c92c4d303a9ec75b8d136544a5e2f0f6bdd43fa03f32dc99b&

nerf chamber

Had the same happen to me. I cleared the whole map and when I stepped int oboss arean they were still playing the organs and dancing... the fight refused to start. It is worth mentioning that I had a Carrion queen unique form abyss on the map that I killed.

Same for me. Bug i'm not sure if i opened this map legit way or through grand project