zephyr: Flash memory partitions not being initialized correctly by settings_subsys_init()

I believe this to be related to #19880

Describe the bug I am attempting to implement the CANopenNode library in Zephyr into my project, but is having issues creating the NVS needed for the EEPROM part. My device is the stm32f4_disco, and I have added the following to the device tree file:

&flash0 {
    /* FLASH memory layout in reference manual Table 5. */
    partitions {
        compatible = "fixed-partitions";
        #address-cells = <1>;
        #size-cells = <1>;
        
        /*
         * Used by CANopen for the Object Dictionary.
         * 32 kB at sectors 0 and 1 (each 16 kB large).
         * Two sectors must be used for NVS.
         */
        storage_partition: partition@800000 {
            label = "storage";
            reg = <0x800000 0x00008000>;
        };
    };
};

and is using a prj.conf with these relevant parameters (inspired by the CANopen examples):

# CAN Settings
CONFIG_CAN=y
CONFIG_CAN_MAX_FILTER=13

# Memory settings, used for CANopen
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_NVS=y
CONFIG_SETTINGS=y
CONFIG_SETTINGS_NVS=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

# CANopen settings
CONFIG_CANOPEN=y
CONFIG_CANOPEN_SYNC_THREAD=y
CONFIG_CANOPEN_STORAGE=y

The project compiles but when running settings_subsys_init() I get error -EDOM. This seems to be because hw_flash_sector does not get updated with values during the call to rc = flash_area_get_sectors(DT_FLASH_AREA_STORAGE_ID, &sector_cnt, &hw_flash_sector);

int flash_area_get_sectors(int idx, u32_t *cnt, struct flash_sector *ret)
{
	struct layout_data data;

	return flash_area_layout(idx, cnt, ret, get_sectors_cb, &data);
}

Where an inaccessible layout_data does get populated with data matching my setup in the dts file. It seems as if the data stored in layout_data should instead be stored in hw_flash_sector (ret), as this is the one getting checked for sector size.

nvs_sector_size = CONFIG_SETTINGS_NVS_SECTOR_SIZE_MULT *
	hw_flash_sector.fs_size;

if (nvs_sector_size > UINT16_MAX) {
	return -EDOM;
}

Expected behavior settings_subsys_init() returns 0.

Impact Annoyance. I can just not check if the subsys initialization worked, but that seems rather risky…

Environment (please complete the following information):

• OS: Fedora 31
• Toolchain: Zephyr SDK managed by platformio
• Zephyr v2.2

Additional context When debugging this, I can see that the Object Dictionary provided is indeed correct, but is stored completely in SRAM. I am unsure if this is due to the initialization not completing. Additionally it seems that CONFIG_SETTINGS_NVS_SECTOR_SIZE_MULT = 1