Non-oak planks do not generate in bonus chests at all

Discovered while testing MC-256500.

The bug

Bonus chests can contain wood of any type obtainable in the Overworld. However, the wooden planks which they can also contain only appear to be the oak variety.

How to reproduce

The reproduction steps in MC-256500 can also be used to reproduce this issue.

Expected results

Bonus chests would have the potential to contain a diverse array of planks species.

Actual results

Only oak planks are obtainable from bonus chests, which is inconsistent with logs and also outdated.