My partition.csv file is:
Name, Type, SubType, Offset, Size, Flags
nvs, data, nvs, 0x9000, 0x5000,
otadata, data, ota, 0xe000, 0x2000,
app0, app, ota_0, 0x10000, 0x3d0000,
fr, data, , 0x3e0000, 0x20000,
coredump, data, coredump, 0x400000, 0x410000,
I have no problem crossing 0x400000, but I have an 8MB chip. Which module are you using and what version of ESP32 is on it?