devtrackers.gg
Is this one of cases where "wiggling" the map around reveals a but more? Does that fix it for you?
Otherwise can you link me your account/character so I can have a look?
For the record this problem is not all too uncommon, and there are scenario's where the wiggling trick (to reveal a bit more of the fog) does not work to resolve it. For clarity's sake, the wiggling "bug" can be used very, very frequently even when such a long delve node does not exist. Or at least, I don't think it has to exist. The wiggling bug works almost all the time whenever used in a place of fog that almost "overlaps" horizontal and vertical fog clearing, if that makes sense. Like a horizontal line where you have also gone 1 cell up.
This problem is at least as old as last league and to my knowledge a lot of people get it.
But is that what you guys actually need? For us to throw you our account names when our delve is in such a state? Because I'd like to see this (sometimes, very, very costly/annoying problem depending on re-route time) tackled as much as the next guy.
Generally speaking "long" Delves work perfectly. I already fixed the problem last league, afaik, but apparently it can still rarely happen. This is literally the first report I've seen of this in months.
The wiggling thing is known and on my todo list.