As title says it is possible to steal stuff from bastion chest by using tnt or hoppers without trigger piglins.
link to demostration: https://www.youtube.com/watch?v=icSSaEig1u4
Linked issues
is duplicated by 6
MC-179109
You are able to get items from a chest with a hopper, without agroing Piglins
Resolved
MC-179198
Piglins will not attack you if you indirectly explode their loot
Resolved
MC-180235
piglin base / chest
Resolved
MC-192003
Hoppers used to raid Bastions.
Resolved
MC-197093
Piglin can't angry by player openning hopper.
Resolved
1 more links
I think stealing loot with hoppers sounds intentional, but blowing chests up with tnt sounds like a bug.