[Plank Sack] Planks made at saw mill do not get counted by Plank Sack plugin

[jchilderbrand]

This issue is for the external plugin: Plank Sack
Plugin version: {version goes here: 1.3.1
When creating planks from logs at the sawmill, they are now added to the plank sack automatically if there is room. The plugin doesn't add the number of logs converted into planks and added to the sack automatically.