Flexfield Parameters for Assignment DFF not working on Change Assignment flow

We have made the following setting in the context segment for the DFF (PER_ASG_DF) assignment:

In the Manage Contexts area, we have created the context code = IN for the context field. After we deploy the flexfield, the DFF only gets displayed for the Add Assignment flow but not for Change Assignment. Have you already experienced similar problems with a parameter for this assignment DFF in the change assignment flow? Thank you!