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Yes, you have read the title correctly. The developer of the PS4 Save Editor Tool has stated today on Twitter that Sony has patched the Save Editor on the firmware 4.50. If you have updated, sorry, but you may not be able to use it at the moment. I don't know if the developer would fix it for the latest firmware, but I suggest you to hang tight. The update came out today, so hopefully you all haven't not updated it just yet!
To translate CyberGadget's Twitter from Japanese to English:【Save Editor for PS4】
"
It was confirmed that patch cord can not be applied correctly when updating the PS4 main unit to the latest system software "4.50". We apologize for any inconveniences, but please do not update to "4.50" when using save editor for PS4 at the present moment."