Reaction event from facebook messenger are not processed

[shtents]

Receiving message_reactions is enabled in the app settings.
But I don't get any event when the user reacts to the message. (I tried event.isReaction and event.rawEvent). There is no error in this case either.

If I send a test webhook message_reactions using developer.facebook.com I get an error (the error is caused by the fact that a pseudo sender is specified in the test message and bottender cannot access his profile)
Could you check what the reason is and fix the problem.
Thank you in advance!

To Reproduce
Subscribe to message_reactions
React to message from messenger
Try to receive event.isReaction
It's nothing now.

Expected behavior
Expect event.isReaction and event.reaction