Unexpected bahavior with Intel Strata flashes

Hi,

I ran into an issue with some ugly Intel Strata J3 flashes. The U-boot target has two of those flash chips onboard. U-boot uses the CFI driver with CFG_FLASH_PROTECTION enabled. These ugly flashes support setting single lock bits per sector, but only completely clearing them for the whole chip.
With U-boot's protect command I can protect single sectors as expected. But clearing the protection also works per sector as it can be seen through the flinfo command. I did not expect this!

Does U-Boot unprotect the complete chip and then 're-'protect all sectors that should be kept protected? This would make sense, but is this really what is done?

Regards
Matthias