I'd swear that there used to be an entry in there for Magisk and/or SuperSU. I suspect the issue is that the /magisk symlink has been removed as of 16.3 and you have to use the /sbin/.core/img/ path instead.
Have you looked into this, @ukanth?
I made a pull request: https://github.com/ukanth/afwall/pull/830
@ukanth Please have a look at it, should not break anything.
@DaleBCooper add paths instead replace them to do not break magisk versions <16.3
@varhub Done.
_closed by #830_.
@ukanth , could you close it if you have time?