Meditation progress won't increase

[BigDaddy]

I'm currently working on creating an anima tree related mod and I made an anima sprout that has the exact same xml def as the vanilla tree version, minus the changed defname. However, when colonists meditate at it, the meditation progress wont increase like it does with the regular tree. If I click the dev "add 100% progress" button, it still spawns the grass, it just won't seem to increase on its own. Any idea what might be going wrong?

[BigDaddy]

Here is the xml file in question