The output info for a new stream is marked pending until the last
sample of the previous stream has been processed. However, this fails
if the previous stream has already been fully processed. We need to
detect this case explicitly to avoid signalling the output change one
sample too late.
#minor-release
PiperOrigin-RevId: 512572854
(cherry picked from commit 7ffcc6f7ea648fb89b487f4c381b1d886cc8a638)
f011cc814a