As we know Power Platform connection/link isn't reversible once the integration between the two systems is done. Disconnecting them would result in data loss as we only have the delete both instance option.

Given the scenario that, we are not able to refresh the data only in CE but not in FnO side. There is no reset option in PPAC as mentioned. The work around is having another CE available environment which we can use to perform a restore and get the desired result for the target CE environment.