The room is now joined after having actualised the rooms list, to avoid the synchronisations waits that can sometimes disable to enter the room (message "You're not into this room" or simply "You're not in this room yet. *Join the room*")

src/domain/session/room/RoomViewModel.js

@@ -210,8 +210,8 @@ export class RoomViewModel extends ViewModel {
                    if (args.length == 1) {
                        let roomName = args[0];
                        try {
-                           await this._options.client.session.joinRoom(roomName);
                            const internalId = await this._options.client.session.joinRoom(roomName);
+                           await this._options.client.session.waitForRoomFromSync(internalId);
                            this.navigation.push("room", internalId);
                        } catch (exc) {
                            if ((exc.statusCode ?? exc.status) === 400) {

src/matrix/Session.js

@@ -948,6 +948,23 @@ export class Session {
             return body.room_id;
         });
     }
+
+    waitForRoomFromSync(roomId) {
+        let resolve;
+        const promise = new Promise(r => { resolve = r; })
+        const subscription = {
+            onAdd: (_, value) => {
+                if (value.id === roomId) {
+                    this._session.rooms.unsubscribe(subscription);
+                    resolve();
+                }
+            },
+            onUpdate: () => undefined,
+            onRemove: () => undefined,
+        };
+        this._session.rooms.subscribe(subscription);
+        return promise;
+    }
 }
 
 export function tests() {