The new OSPF is a complete rewrite.I don't know what's wrong with mikrotik their ospf doesn't work well with huawei or VyOS at times.
Ok just found out, that it only works for maximum 1500 MTUEven they provide examples in the docs
But somehow I still haven't been able to use IS-IS for multi vendor
Tried with JunOS and IOS-XE , none of them works