Challenge room didn't spaw enemies or rewards

[kind parcel]

No cross on the ground apeared

Hitting the chest again started it

I guess it's the common bug that can happen on any chest

[pliant field]

You opened the chest with the knife, right?

[kind parcel]

I was playing crossbow, I don't remember

[pliant field]

I guess you opened it with an explosion, that opens it visualy but not really