I just now found out that Ikora had something to say to me over a month ago when we saved Saint. This has happened more than just this one time.
The blinking icon saying that the vendor has something to say is overridden by the challenge icon telling me about an engram that does not benefit me, at all.
Let the blinking icon either override the challenge marker, or let them co-exist.
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Or just casually walk up to each vender and say hello.