I'm having a weird issue with defender since a recent update (can't tell you exactly which one).
Defender is listing the same files over and over again. All our site use ludicrousdb so we have the db-config.php file that defender doesn't recognize as a wordpress native file. This has always been like that and I really don't mind. I just set it to ignore the file and that's it.
Recently, defender is listing the same file over and over. Today I woke up to 241 file notifications and most of them are the same file, db-config.php
I took a snapshot and put it here https://laurasales.com/wp-content/uploads/2018/12/defender-bug.png
I got rid of all the notifications by manually running a file scan, but this is a very expensive action on such a large site.
Anyway, just thought I should let you know about it.