Cannot pick up roses Incarnation of Dread

Hello!

During Incarnation of Dread boss fight, I died after defeating two subbosses, but I suppose it was before any rose appeared, so after I respawned it is impossible to pick up them and the boss is invulnerable.

Recorded a video, hope it helps: https://www.youtube.com/watch?v=DN5BM7vk5GM