Listener command wrongly showing "never published"

[AmeliaEScott]

Describe the bug
When running the "listener" command on the PX4 shell, it sometimes shows "never published" for topics that have absolutely been published. This happens when using the -n or -r arguments and NOT -i. Below are some examples (with the topic data removed, for brevity):

nsh> listener vehicle_attitude
  [correct topic data]
nsh> listener vehicle_attitude -i 0
  [correct topic data]
nsh> listener vehicle_attitude -i 0 -n 2
  [correct topic data twice]
nsh> listener vehicle_attitude -n 2
never published
nsh> listener vehicle_attitude -n 2 -r 2
never published

This behavior is the same in SITL.

To Reproduce
Steps to reproduce the behavior:

1. Choose a topic that has been published (Run uorb top to find some such topics)
2. Run the command listener <topic> and listener <topic> -i 0 -n 10 and observe correct behavior
3. Run the command listener <topic> -n 10 and observe never published.

Drone (please complete the following information):

• FMU V5 Test bench running the latest master branch as of the time of submitting this issue
• Same issue in SITL

[AmeliaEScott]

Perhaps related to #12799

[dagar]

Yes I was aware this slipped in with #12799 and was planning to go back and fix it.