Context: I have some old Doge wallet.dat files from 2013-2014.  Last night, I spent some time dumping the private key from one of the addresses using the newest version of Dogecoin Core and importing it into a new Multidoge wallet.  Everything seemed to work correctly, and Multidoge recognizes the receiving address corresponding to the private key that I imported.

Problem: However, one thing is puzzling me.  Although it isn’t synced, Dogecoin Core is showing a list of old transactions from my old wallet file.  When I tried to enter one of the addresses corresponding to these transactions into the Doge Blockchain, it yields a result that shows the address has no transaction history whatsoever.  No balance, no coins sent/received, 0 transactions.

What could be happening here?  I haven’t been much paying attention for the past few years, but was there ever a hard fork or something where the entire pre-fork blockchain was abandoned somehow?

Any insight would be greatly appreciated.  Thank you!