rostopic echo complains messages not built, but rosmsg says fine?
Background: I have a fresh container of ros-noetic-base, that I want to have full readability of a ros master elsewhere.
rostopic list works fine, so connection to master is fine
rosmsg info specific/message/type works fine. it gives me full details on the message type
rostopic echo /some/topic FAILS, complaining: ERROR: Cannot load message class for [specific/message/type]. Are your messages built?
How can rosmsg be working fine, but rostopic echo fails like this?
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