join nodes really organize and send three different topics?

[ryoichi-obara]

In https://cookbook.nodered.org/basic/join-streams you've mentioned

it will send on a message each time it receives at least one message from three different topics

But I got a message from this join node when I inject a same temperature node 3 times, { temperature: 10 } (It has no humidity and pressure).

Is that page said correct especially "at least three different topics"?

[dceejay]

Need to investigate some more - but initial thought is that you are right. It should behave as described in the words, when in that mode.