A bug is making some letters appear as question marks on messages sent by RCS from iPhone users to Android users.
Now that iOS 18 Beta 2 has been distributed by Apple, iPhone users have been able to support RCS messaging which means that finally iOS and Android users can enjoy a high-resolution image sent by one to the other. They also receive read receipts (although this has been missing from iPhone users in a group chat with Android users along with end-to-end encryption, and emoji reactions).
While some features are missing from the RCS support thus far, something strange has been added to messages between iOS and Android users on RCS: Question marks. On some texts sent using RCS from iPhone users to Android users, question marks are appearing where they are not supposed to appear in a message. Check out this post from one social media user explaining the situation.