No, that isn't normal, there's some severe necrosis from the root up. Usually the leaves would melt and new growths would show up, but from looking at your picture provided, it looks like the rhizome is rotting / melting which is no good. Are there any parts of that anubias that have hard green spots? Basically no melting? If so, the only way I can see you salvaging would be to cut the rot off.