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It was when in the partition table there is a partition with type="data" and suptype=""(empty), in this case type=1, suptype=0. It is similar to otadata partition. This commit fixes it, now it will handle it as type=1, suptype=6 (ESP_PARTITION_SUBTYPE_DATA_UNDEFINED).
See the spi_flash.rst in the programming guide folder for more details. The docs above is for the new SPI Flash API above 4.0, for legacy implementation (CONFIG_SPI_FLASH_USE_LEGACY_IMPL enabled), read README_legayc.rst in the same folder with this readme.