Can't get entity from button in my custom action

Rasa Open Source
1

Hello all. I tried to test a button passing as message text directly:

/my_intent{{"my_entity":"bla"}}

If I debug, the right action action_my_intent is triggered, the tracker has the right text but no entity are in the tracker.

The entity is correctly defined in domain.yml under entities:

2

Forgot to say I’m using Rasa 3.0.8