next map didn't unlock after completed a map

i completed map at the center (green one) and "mire" map is directly connected to this map but it didn't unlock and i can't progress to citadel because this map is the only way to reach there. am i need to do something to unlock map or is this a bug?

I've had this happen to me a couple times.

Fortunantly in my case I was able to path to the node from a different side and it properly connected then.

Pretty sure it's a bug and nothing on your end.