Start decryption process if needed

src/Notifier.ts

@@ -331,6 +331,8 @@ export const Notifier = {
         if (!this.isSyncing) return; // don't alert for any messages initially
         if (ev.sender && ev.sender.userId === MatrixClientPeg.get().credentials.userId) return;
 
+        MatrixClientPeg.get().decryptEventIfNeeded(ev);
+
         // If it's an encrypted event and the type is still 'm.room.encrypted',
         // it hasn't yet been decrypted, so wait until it is.
         if (ev.isBeingDecrypted() || ev.isDecryptionFailure()) {