Attempted the update last night, when flashing Magisk Canary Patched boot.img, the touchscreen is non-responsive on boot.
Flashing the stock boot.img and the touchscreen works.
Tried flashing the full image (no -w) and OTA with same result both times. Tried switching between active slots as well, no dice.
Had the same issues as you last night. Tried it again just a few minutes ago and it worked! This time when I installed and ran Magisk Manager, there was an update. Looks like TopJohnWu updated the canary files 7 hours ago. Magisk Manager is now 298 and the zip is 20425.