Here is how to get this glitch:
1: Open Minecraft: Java Edition in Snapshot 17w50a.
2: Create a new world with world type set to AMPLIFIED, use the seed 4237599434424850135 and use Creative Mode.
3: Teleport to X: -507 Y: 144 Z: 58
4: You Will see that a tree had spawned on top of a Tree.
Mojang, please fix this.
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Please put this issue as Confirmed, I am telling a lie the truth.
The tree at the given coordinates in a amplified world with the given seed is a normal default Acacia tree.

can you please re-open the Issue? I can prove that the nearest tree at the coordinate X: -507 Y: 144 Z: 58 has got a tree on top.

I even have a photo of proof
Please attach a screenshot here.

The acacias at the seed (Amplified as well as Default) look pretty normal to me.
However, it is possible for trees to generate on top of each other in 18w10d.
[media]
Seed (Default World): -1904660148
Coords: -254 69 336

Please check if that's still an issue for you in the 1.13.1 release.