Giant oak trees do not replace the grass blocks they are spawned on with dirt.
Tested in creative and survival with saplings grown both with and without bonemeal, and with naturally grown trees.
Linked issues
relates to 3
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Comments 21
Confirmed on IOS 8.2, ipad 3
confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1, MCPE 0.14.2
Fixed in 0.14.3
I mistakenly read the description as dark oak trees, sorry! This does still affect Giant Oaks..
@Mega_Spud Ahh...missed it. 🙂
Affects 1.17.30
Affects 1.17.40.20
Affects 1.19.10
3 Giant oak trees with no grass under them right after I grew them.
(I broke the bottom logs)
[media]affecting 1.19.83
I can still reproduce it at 1.21.30.22

Confirmed in 1.21.44
Confirmed on Samsung Galaxy Note 3