Sorry for bad English
With the loss of adjacency with the neighbor (no longer receives hello packets due to disconnection) Mikrotik removes the active routes from the kernel, but does not delete the LSA from the base OSPF. In some cases this leads to a routing loop.
Example:
network --- neighbor1(area1) - / - Mikrotik(ABR) --- neighbor0(area0, ASBR)
Mikrotik is ABR, LSA receives from neighbor1 and distributes area0. Adjacency with neighbor1 lost, but continues to distribute Mikrotik LSA in area0, while deleting a route to the network from the kernel. A packet with destination network will be forwarded to the Mikrotik, Mikrotik but no route to that network, it will forward the package to neighbor0, neighbor0 send the package back as he continues to receive an invalid LSA from Mikrotik - there is a loop route.