__block_disagg_read_multiple reads a page image and a chain of zero or more page deltas. It validates this data by iterating over the chain from the newest to oldest entry, validating the checksum of each.

If there is a checksum mismatch it prints the same message (cut-and-paste from the standard block manager). It would be useful to know where the checksum error occurred. Was it on the full page image or a delta? If a delta where in the chain? I.e., Kth of N deltas.