1. A computer program product for facilitating data coherency, the computer program product comprising: a non-transitory storage medium readable by a processor and storing instructions for execution by the processor to perform a method comprising: responsive to initiating a data store operation to modify original data from which translated data has been obtained, checking whether at least one guard bit associated with the original data is set to indicate protection of the original data, and responsive to the checking indicating that the at least one guard bit is set: faulting the data store operation; and initiating discarding of the translated data.