Was smaller than the three I made as well. Strange isn't it?
Didn't help me. Did it fix your issue?
If someone can tell me what I am doing wrong great but I have had my phones rooted for damn near a decade and thus is the most recent set of steps I use.
Installed the latest canary magisk manager. From there wen tto install magisk by patching the boot.img from the version of android I am running by downloading the zip from the google pixel image site for android 11. At this point there is only one file offered for android 11 so it's hard to miss. I extract the image file and take out the boot.img file. I adb push it to my phone. From there I go to install magisk and select the option to patch the boot file or whatever it is called. I select the boot.img file and then patch it. It creates the magisk_patched.img file. I send that to my computer go into fastboot and either have tried installing or just running the file by either doing fastboot boot magisk_patched.img or fastboot flash boot --slot all magisk_patched.img. When I just boot (which worked in version 10) it fails the first boot, goes into recovery and then after clicking try again it rolls back. When i do the flashall I have to reflash the stock boot.img. Anyone have any ideas?