Oasis rare spawn bug out of map

I know these type of posts are common but I am just adding my experience with this bug for the first time.

Every point of the map was cleared and no way to get to where the rare is. 7 mobs left including the last rare.

https://gyazo.com/c43d2d4d11ed22e6b991c81bc141faaa


If i am missing something please let me know!