When using a map created by the old unlimited tree mod, make sure to subscribe to all required trees by the map. Loading is stable for maps created by old unlimited trees mod. If you have been working on a map for some time using the old unlimited trees mod, please be aware that you might experience the following issues.

If you are loading a saved game from the old unlimited tree save format, make sure to save first using my mod, then reload the map. If trees are missing or swapped with a different kind of tree, please read below to understand why and possible solutions.
Here are the reasons:

1. The Old Unlimited Trees mod does not perform error correction when loading the Prefab, as it just saves the index. When loading, sometimes the index points to a different tree within the Prefab Collection, and the game happily continues to work, even though that's not the right tree. This will result in situations when using my mod where association is made with Prefab Collection, and a completely different tree will show on the map.
   
2. There are cases when trees are not visible on the map, but when updating the area where trees are missing, causes the trees to reappear. This is due to when loading old Unlimited Tree saved games or map, a tree asset is missing, or the index of the Prefab was incorrect. These trees are still there, but located below the terrain. You will need to update the area either by (1) placing new objects, (e.g tree, road, building etc) or (2) using terrain tool and smoothing the area will cause the trees to be relocated to correct terrain level or (3) use MoveIt and select the trees below the terrain, and set their height to terrain level
   
3. In the case where the Old Unlimited Trees mod saves an index that does not exist in the Prefab Collection (Maps created using Old Unlimited Trees mod, then loaded by a different user with missing tree asset). What will occur is some trees will most likely be swapped with a different tree, or they would appear below the terrain, or lastly just disappear using my mod, because these trees just doesn't exist in the Prefab Collection.

These problems will not occur if you are using a map that was created without the old unlimited trees mod. If you are using a map or game save created with old unlimited trees mod, to be on the safe side, just save the game again with my mod and restart it.