Bug? Creating document with custom permissions won't trigger realtime event

Basically, I have the following structure database:

Profile -[many]-> UserConversation -[one]-> Conversation -[many]-> Messages

Profile <-[one]- UserConversation <-[many]- Conversation <-[one]- Messages

It happens that, when an Auth user (with his profile) has a UserConversation, it points to a conversation, where another person should also be, connected through his own UserConversion.

sendMessage (server function): creates a new message, needed just to include document permissions:

// server-function-self-hosted 1.5.5 
// – "node-appwrite": "^9.0.0"
// - "appwrite": "^13.0.0"

    const newMessage = await database.createDocument(
      DATABASE_ID,
      MESSAGES_COLLECTION_ID,
      ID.unique(),
      {//...data},
      [
        Permission.read(Role.user([currentAccountId])),
        Permission.update(Role.user(currentAccountId)),
        Permission.read(Role.user([participantId])),
      ]
    );

Finally, it happens that the person sending the message, it means, creating the document, (currentAccountId) is notified about the creation. But the other person (participantId) is not.

I've made some tests: I thought when the event trigger is created, the permission could not have been updated yet or anything like that – while the creator was already there by default and my setup is merely rewriting. Seems not to be true, since I included an updateDocument for testing, and it still does not notify the other person, just the creator.

Hope someone can put me in the right direction. I tried to describe everything as needed – if some info is missing, please, just let me know and I will kindly respond to figure it out.