Hi thank you for your help!If you didn't disable
If you didn't disable Verity and Verification, then you should be only flashing the copy of the kernel that you ran Magisk on. I'm guessing you didn't do that since the filename of the kernel image would be different than that, unless you renamed it.
Flash the stock boot.img and run Magisk on the CleanSlate kernel, then flash the Magisk'd CleanSlate kernel.
First before I started to flash anything i copied the cleanslate boot img file to my device and patched it with magisk , In the download folder I got a new file that called magisk_patched-23016_ipHwv.img
Than I copy it back to my computer and flash it
After that I flashes the rest of the files like in the instructions.
Is that ok?