rasa data convert config does not create data/rules.ymlfile

[koaning]

I'm working on another season of breakoutbot and I'm converting my project from Rasa 1.10 to Rasa 2.0. Here's the version I've got installed locally;

> rasa --version
Rasa Version     : 2.0.2
Rasa SDK Version : 2.0.0
Rasa X Version   : 0.32.0
Python Version   : 3.7.7
Operating System : Darwin-19.3.0-x86_64-i386-64bit
Python Path      : /Users/vincent/Development/breakoutbot/venv/bin/python3.7

I'm now about to convert a config file that looks like this:

language: en

pipeline:
  - name: WhitespaceTokenizer
  - name: RegexFeaturizer
  - name: LexicalSyntacticFeaturizer
  - name: CountVectorsFeaturizer
  - name: CountVectorsFeaturizer
    analyzer: char_wb
    min_ngram: 1
    max_ngram: 4
  - name: DIETClassifier
    epochs: 100
  - name: EntitySynonymMapper
  - name: ResponseSelector
    epochs: 100

policies:
  - name: MemoizationPolicy
  - name: TEDPolicy
    max_history: 5
    epochs: 100
  - name: MappingPolicy
  - name: FormPolicy

To achieve this I'm running:

> rasa data convert config
Your model configuration contains the 'FormPolicy'. Note that this command does not migrate the 'FormPolicy' and you have to migrate the 'FormPolicy' manually. Please see the migration guide for further details: https://rasa.com/docs/rasa/migration-guide
2020-10-27 11:37:09 INFO     rasa.shared.utils.validation  - The 'version' key is missing in the training data file /Users/vincent/Development/breakoutbot/domain.yml. Rasa Open Source will read the file as a version '2.0' file. See https://rasa.com/docs/rasa/training-data-format.
Output file 'data/rules.yml' did not exist and will be created.
Migrating the 'MappingPolicy'.
Finished migrating your policy configuration 🎉.
The migration generated 0 rules which were added to 'data/rules.yml'.

The feedback I get suggests that a new file has been created over at data/rules.yml. Unfortunately, this does not seem to be the case.

> ls data 
total 16
-rw-r--r--   1 vincent  staff   1.1K 27 Oct 11:17 stories.yml
drwxr-xr-x   4 vincent  staff   128B 27 Oct 11:17 .
-rw-r--r--   1 vincent  staff   2.9K 27 Oct 11:17 nlu.yml
drwxr-xr-x  30 vincent  staff   960B 20 Oct 13:12 ..

It's probably due to the fact that zero rules needed to be generated. This feels like a bug though, the user feedback does not match what is happening to my filesystem.

[koaning]

It seems like some more unexpected behavior is happening. When running the convert command it seems like the config.yaml file does not change despite the logs mentioning Migrating the 'MappingPolicy'.