State Machine transition does not recognise the state field changing Follow

In a state machine rule, I have the following problem:

In the action function, I want to check, if the state field of the issue is changing using the isChanged function (and the becomes function afterwards). This should obviously be true, as the transition itself is nothing but a complex way to change exactly that field (this is for debugging purposes, as my actual problem is far more complex, but I think I narrowed it down to this problem).

Curiously, this seems to be false for some reason. From a workflow perspective within the action function (and e erything this function calls), the issue looks, like it is not being touched at all - it's stage field is set to the old value and isChanged is false. See a minimal example below (the message will not print). This is actually a big problem in my setup, as I have other workflows getting called, which need to detect if the issue's stage is changing.

Is there any way to fix this or did I miss anything?

var entities = require('@jetbrains/youtrack-scripting-api/entities');

var states = {
  'Some State': {
    transitions: {
      'to other': {
        initial: true,
        targetState: 'Other State',
        action: function(ctx) {
          if (ctx.issue.fields.isChanged(ctx.Stage)) {
            console.log('Stage is changing');
          }
        }
      }
    }
  },
  'Other State': {
  }
};

exports.rule = entities.Issue.stateMachine({
  title: 'some-state-machine',
  fieldName: 'Stage',
  states: states,
  requirements: {
    Stage: {
      type: entities.State.fieldType,
      name: 'Stage'
    }
  }
});