Continuing the conversation here…
If what you are trying to accomplish is installing the OTA on a system that has a Magisk patched boot partition, that won’t work.
The updater checks the hashes for all the partitions, so you’ll have to restore the original boot partition before you can install the update. Believe me I have tried a lot of ways… (But there still might be a way I haven’t thought off, I’m still far from an expert 
)
Why can’t you disable Magisk temporarily and install the update the regular way? 
That should keep your modules installed just fine, I believe