Strippable keys (and other keys) are not updated on server updates

[Jsinco]

Spark link

https://spark.lucko.me/Q7DMc9iBPV

Expected behavior

When updating a server from 1.21.3 to 1.21.4, pale oak logs/wood are not added to the purpur.yml configuration. The default behavior of the key not being present is for Purpur to just cancel the event/stripping of the log.

Observed/Actual behavior

It appeared that the stripping of the log was just cancelled.

Steps/models to reproduce

• Download Purpur's latest build of 1.21.3.
• Start the server and let it finish loading.
• Stop the server and replace the 1.21.3 jar with the latest build of Purpur 1.21.4.
• Start the server again and try stripping pale oak logs/wood.

Purpur version

Current Purpur Version: 1.21.4-2383-88ed744 (MC: 1.21.4)*

• You are running the latest version
  Previous: 1.21.3-2358-16ce24a (MC: 1.21.3)

Agreements

• I am running the latest version of Purpur available from https://purpurmc.org/downloads.
• I have searched for and ensured there isn't already an open issue regarding this.
• I ticked all the boxes without actually reading them
• My version of Minecraft is supported by Purpur.

Other

No response