Fastboot boot of Magisk boot.img didn't help still bootloop.
Unfortunately there is no recovery.img in update.zip, only boot.img.
Here's a Magik patched boot.img I successfully used with vbmeta ticked because technically Leaf returned as having vbmeta (even if it isn't normal):
https://drive.google.com/file/d/1umz...ew?usp=sharing
Here's a Magisk patched boot.img without vbmeta ticked which I didn't use, but made just in case:
https://drive.google.com/file/d/1vUx...ew?usp=sharing
Here's my whole decrypted update.zip from my Leaf running firmware 3.2, because it might help others in future, yes there's an unmodified Leaf boot.img in there:
https://drive.google.com/file/d/1qy7...ew?usp=sharing