Hi there,
I don’t know if this is intended, anyhow I will state what happened to me a few mins ago.
I was in an Echo and opened a Portal before I reached the objective.
I finished the objective and since the Portal was already created I decided to use that one instead of creating a new Portal.
What happened is that I failed the objective and got kicked back 4 Echoes.
Now I see that the portals are indeed of a different color, but at least there should be a message informing you that if you take said Portal created before objective is complete will set you back 4 Echoes.
Regards