Same exact problem. I've also tried the latest beta Magisk from Git with the Canary channels to root but it didn't work.Same here. Had perfectly fine working root access and I patched the boot img from the newest recovery from MS's website. Reverted back to stock boot and did OTA. Every time I attempt to boot the patched img it just hangs at the MS logo. Regular boot works just fine. I'm bummed that I lost root access now.