All giant taiga trees and giant jungle trees have one log block in the northwest corner (negative X and negative Z) that is slightly higher than the rest of the logs on the tree. I believe the tree should either have a random raised corner or no raised corners, but the constant raised northwest one is horrifying to look at and seems a lot like a bug.
I've attached a screenshot with a seed that spawns you near a mega taiga so that you can see the issue. I've tested multiple seeds, so it isn't a weird part of this specific seed. This also includes giant taiga trees and giant jungle trees grown with bonemeal.
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The resolution of MC-36762 is just an assumption by a bug report moderator. I do not think this is intentional because there's no real reason to only raise a northwest log. Just because it exists in the code does not mean it was intentional, and it kind of ruins the beauty of 2x2 taiga/jungle trees from above. It's not a game-breaking bug that needs to immediately be fixed by any means, but it's been around for a while and communicating it to a developer would be the best way to resolve the unintentional/intentional debacle.
Duplicate of MC-36762, which is working as intended.