Cannot complete delve node

Bug report #3849907639

Description:
I reached the end of a very long delve path (it was a "beast" node). I killed the red beast which becomes green, but i got no loot and the bonus chest is still locked.

See screenshot (perhaps i did something wrong?)

Tried again now, it happened again (same bestiary node).

#3749681204

Two beasts, one red and one yellow. They turn green when killed, the chariot does not explode into loot as usual, the "feral jewellery" chest is locked and the light road to previous node does not turn on.

Please if I do something wrong let me know. What I'm supposed to do with those green dead beasts?

HG