io.github.libtmux.TextOutcome.TextOutcome.PRESENT_AT_ENTRY

Exactly that, and no more. It may be output from a command the caller started a moment ago and that finished before the first read, or it may have been on the pane for an hour — a screen cannot tell those apart, and reporting them as the same thing would be the claim this outcome exists to avoid. A caller that needs the difference should not be reading a screen: append ; tmux wait-for -S name to its own command and block on Server#channel , which is exact.

An echo of what this library typed is never what is found here; that is the caller's own question coming back, and it is discounted.