well the bug is you can destroy your builds permanently whit raiding items.
but not straight up so you can test raid safely BUT make sure you dont rocket your base after you close raiding tab. i lost one of the biggest clan bases i got and just shocked like:
why its not gettin back to normal. then i find out if you thorow the ball shaped explosive while the raiding tab is open then closing thje raiding tab before the impact = gone base
but if yo usaved its ok
also you can interract whit blown up parts by hovering your mouse over them while the building tab is open!