I can see it too. It might be a bug so it would be better if you report this through in-game CS or create a bug report thread in this forum with all the necessary details so the devs can check it out
when u pick the hero,, did u choose the lane that u want to go?
like "i want to Roam"?
"i'll Roam"
maybe cause of this,, i met this issues before,, cause i pick saber and i roaming but still can't
after i change the map lane from jungle to roaming
it completed
idk it's only my luck or what,, but u can try it,, if still failed just forget abt it lol..
Maybe you actually need to get a Gold Medal? Although you can try @-IceMount's suggestion and set your lane chosen to "Roam" or do "I want to roam" chat and choose a Support Emblem? :p