I also experienced the same phenomenon in the campaign during the game.
I've seen users on kin.naver.com experiencing the same symptoms.
These chests spawn on trees, but spawn when that tree is collected.
I've experienced the same symptoms, but a few more heals of netherrack will fix it.
jeongjo13jeongjo13
MCLG-429
MC-264248
I also experienced the same phenomenon in the campaign during the game.
I've seen users on kin.naver.com experiencing the same symptoms.
These chests spawn on trees, but spawn when that tree is collected.
I've experienced the same symptoms, but a few more heals of netherrack will fix it.