If there are any failures which may lead to a stage retry, but retrying the stage translates into potentially having an inconsistent result (indeterminacy) then this exception is raised. The exception is raised in newer version where the validation is performed, likely unavailable in DBR 10.4 and older versions.
To address the problem, you may as per the error message, checkpoint the DF before the indeterminacy is introduce.
This can be commonly seen in scenarios where there are nodes lost, for example due to spot instance termination, or similar events, not fully sure about a scaling down event, but could also be another reason.