Mine at my house were doing that. Now they are being cut down, one at a time. Eab is a nasty critter.
It’s due to EAB - last ditch effort of tree to survive. Stoves probably on sale as they won’t meet EPA regs come March. Come March they’ll be illegal to sell. It’s ok to owm\use if you buy prior to March but they can’t sell them, even stock on hand after end of February.
About the stoves - cutoff date is May 15, can’t sell stoves after that date that don’t meet the EPA 2020 regs.
My hickory shoots About 3/4 of the way up this picture, you can see a light brown spot. If you can zoom in, it's bark starting to flake off. And finally, the dead, broken top.