At least Behringer Xenyx 302USB doesn't have any Mic mixer elements (or indeed any capture mixer elements), so having analog-input-mic as the only input path caused the input mappings to not show up on this sound card.
Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1325 Part-of:
16f0a4d7f alsa-mixer: Add analog-input path to TI PCM2902 mappings
.../mixer/profile-sets/texas-instruments-pcm2902.conf | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)