Tests fail after switching from Flow 5.0 to 5.1/5.2

Hi there

Our integration tests fail after switching from Flow 5.0 to a newer version with this error message:

Tried to check a session data entry, but the session has not been started yet.

The controller actions all contain @Flow\Session(autoStart = TRUE) and the necessary use statement is at the beginning of the file.

Can anybody help?

Cheers
Tom