'Any unused area between firmware files will be filled with FF' - and I bet that the NVS area is somewhere between your bootloader and app. Solution, if you insist on flashing the combined binary, would be to customize your partition table so the NVS partition comes after the app partition ...

Hello,

I am using the Flash Download Tool to flash binaries to my ESP32-C6-WROOM-1.
I store some important data (a bool and an unsigned integer value) in NVS, and this works correctly because after a power restart I can still read the saved data.

When I make changes to my program and build it, the ...