This bug was found on a multiplayer server being used to replace Bedrock, and was replicated also in single player. The screenshots were taken in Single Player 1.7.4 and can be used to replicate the bug.
This is unintended as trees are only supposed to be able to replace air/leaves
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If you don't mind me asking, is this a duplicate of an issue not visible because I was sure to search extensively before posting this bug, unless my search was to specific of involving Dark Oak trees?

nvm....