Rasa

Bugfixes
- [7235](https://github.com/rasahq/rasa/issues/7235): Slots that use `initial_value` won't cause rule contradiction errors when `conversation_start: true` is used. Previously, two rules that differed only in their use of `conversation_start` would be flagged as contradicting when a slot used `initial_value`.

In checking for incomplete rules, an action will be required to have set _only_ those slots that the same action has set in another rule. Previously, an action was expected to have set also slots which, despite being present after this action in another rule, were not actually set by this action.

Bugfixes
- [5974](https://github.com/rasahq/rasa/issues/5974): `ActionRestart` will now trigger `ActionSessionStart` as a followup action.
- [7317](https://github.com/rasahq/rasa/issues/7317): Fixed Rasa Open Source not being able to fetch models from certain URLs.

This addresses an issue introduced in 2.0.3 where `rasa-production` could not use the models from `rasa-x` in Rasa X server mode.
- [7316](https://github.com/rasahq/rasa/issues/7316): `SingleStateFeaturizer` checks whether it was trained with `RegexInterpreter` as
NLU interpreter. If that is the case, `RegexInterpreter` is used during prediction.

Bugfixes
- [6629](https://github.com/rasahq/rasa/issues/6629): Fixed a bug that occurred when setting multiple Sanic workers in combination with a custom [Lock Store](lock-stores.mdx). Previously, if the number was set higher than 1 and you were using a custom lock store, it would reject because of a strict check to use a [Redis Lock Store](lock-stores.mdx#redislockstore).
- [7176](https://github.com/rasahq/rasa/issues/7176): Fixed a bug in the [`TwoStageFallback`](fallback-handoff.mdx#two-stage-fallback) action which
reverted too many events after the user successfully rephrased.

Bugfixes
- [7200](https://github.com/rasahq/rasa/issues/7200): Fix a bug because of which only one retrieval intent was present in `all_retrieval_intent` key of the output of `ResponseSelector` even if there were multiple retrieval intents present in the training data.

Bugfixes
- [7140](https://github.com/rasahq/rasa/issues/7140): Fixed error when starting Rasa X locally without a proper git setup.
- [7186](https://github.com/rasahq/rasa/issues/7186): Properly validate incoming webhook requests for the Slack connector to be authentic.

Bugfixes
- [7089](https://github.com/rasahq/rasa/issues/7089): Fix [ConveRTTokenizer](components.mdx#converttokenizer) failing because of wrong model URL by making the `model_url` parameter of `ConveRTTokenizer` mandatory.

Since the ConveRT model was taken [offline](https://github.com/RasaHQ/rasa/issues/6806), we can no longer use
the earlier public URL of the model. Additionally, since the licence for the model is unknown,
we cannot host it ourselves. Users can still use the component by setting `model_url` to a community/self-hosted
model URL or path to a local directory containing model files. For example:
yaml
pipeline:
- name: ConveRTTokenizer
model_url: <remote/local path to model>

- [7108](https://github.com/rasahq/rasa/issues/7108): Update example formbot to use `FormValidationAction` for slot validation