Single dark oak and pale oak saplings accept bone meal despite not being able to grow

The bug

Single dark oak saplings are not able to grow, and are only intended to grow when in a 2x2 arrangement. However, using bone meal on a dark oak sapling which cannot grow will still consume bone meal.

To fix this, a block state could be added to dark oak saplings that is only true when part of a 2x2 formation, and only with this set to true will they then accept bone meal. Alternatively, a 1x1 variant of the dark oak tree could be implemented.

Example

Here is an example in video: Single dark oak saplings accept bone meal.mp4

Code analysis

Code analysis by [Mod] Avoma can be found in this comment.