Breezy
Comments
After switching to a different version of Minecraft and then back to 16w04a, large oak trees now generate in abundance. They take the place of the 5-block tall trees I observed previously on the seeds, "tree" and "1" After numerous times generating these seeds again, I cannot reproduce the previously found smaller trees that were where the large oaks should be. Not sure what caused them to generate, but it seems it was not a bug.
I've tried generating the same seed a number of times. In this case, I used the seed, "1" which spawns in a larger forest biome. In each case, the largest tree I am able to find is the type described in my last comment. That is, a 5-block tall tree with an extra bit of leaves on one side of the foliage. Every "large" oak tree I find of this type generates exactly the same way, just with the extra leaves on different sides of the tree. I am still unable to find any large oak trees that resemble that in the 15w44b screenshot.
For example, the tree located at 175, 246 near spawn in the seed, "1" generates in the same size, shape, and orientation for me every time I generate that seed.
Nathan, are the large oaks you get in your test worlds the same type/size as the one in the 15w44b screenshot? If so, do you have an example seed I could use to test this?
I used the seed, "tree" in both 15w44b and 16w04a. Turn to the immediate left from spawn and you should see a large oak tree in 15w44b. However, in 16w04a, there is a smaller tree in it's place. It's worth noting that this tree does have a single "branch" coming off it it, making it larger than the surrounding trees. However, it is not a large oak tree as can be seen in the screenshots added. There are also other instances of large oak trees on the spawn island being replaced with this smaller type of tree.
Just to clear things up for good, I believe the issue I was having was the effects of MC-11208, as I continued to intermittently experience a lack of large oak trees spawning after this thread was marked solved. This issue has now been sorted out as of 18w07a.