Grass blocks instead of leaves on a tree

On my vanilla 1.18 Minecraft server on seed -9151117963857163470 on coords -3777, 86, -9743 there is a VERY special tree. It has grass and dirt path blocks instead of leaves. Pics attached. 

The whole village is weird (unfinished pier nearby, houses hanging in the air, etc) but this is different.

The bug is not reproduced when creating a map again on the same server or in a single-player mode. Moreover, in a single-player, the village is different - there is an extra house.

I can attach the map if neccessary.