Answer
You can also open the card from Hashchats’ identity in the reaction or viewer list. Tap the full-size photo for the usual viewer, Forward and Download controls; Share is available in native iOS and Android apps.
Direct Message or DM opens New Chat. Messages on small screens, or Search Messages on larger screens, searches the current chat for the ordinary text Hashchats. It does not filter results by sender. Older builds keep their existing profile-link behavior.