init function handler for custom button unable to set class variable

[bandtank]

I added two buttons to an entity, each of which is meant to run a different action. This is what I am using to test the connectivity:

define(['action-handler'], (Dep) => {
  return class extends Dep {

    actionToRun = null

    initAdjust() {
      this.actionToRun = "adjust"
      console.log("adjust", this.actionToRun)
    }

    initSetPaid() {
      this.actionToRun = "setPaid"
      console.log("setPaid", this.actionToRun)
    }

    async runAction() {
      console.log("run action", this.actionToRun)
      return
    }
  }
}

When the page loads, this is what is printed to the console:

setPaid setPaid
adjust adjust

That makes sense and is what I expected to see. However, clicking either button results in the following output in the console:

run action null

I don't understand the point of the init functions if the classes are unable to store state. What am I doing wrong?