protection
Bonecrusher Giants's "Damage Cant Be Prevented" is not working properly and the 2 damage is being blocked by protection.
the same is for questing beast, when given trample by any source and attacking into a creature with pro green, i cannot trample over my damage or even assisgn the 1 damage for lethal and slam face.
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Rezzahan#77802 commented
The Stomp adventure has the "Damage can't be prevented this turn" clause, Bonecrusher Giant does not. So of course protection will prevent the 2 damage from the Giant's ability. If instead you are refering to Stomp, well, it targets, so protection doesn't even need to prevent damage, it already stops the targeting.
A trampling Questing Beast should be able to trample over a pro:green creature, though, and all but the 1 damage assigned to the blocker can hit the player/planeswalker without being prevented (not that it could be prevented in the first place). You sure you assigned only 1 damage to the blocker?