WrongExpectedVersion error when using ExpectedVersion.Any (-2)

I thought I may ask before I go looking at causes for the error with expected version Any … Note quite possible client is version 5 and server 4.11.

Message: Append failed due to WrongExpectedVersion. Stream: livehole-LiveHoleBL.7b011e2c5a19431d98a48a6a238a1829, Expected version: -2, Current version: 692