When opening a thread with #Fedilab, there is a kind of target icon at the top right.
It is only displayed when the first message of the thread comes from another instance.
Your instance might not be aware of all replies in this thread. So by tapping on that icon, all replies will be displayed. You will be able to interact with all messages even if they are unknown by your instance (the app will manage that for you in background).
You can define in settings as a default behavior (Interface).
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