Windows 10 File History not working right

Although, as far as I know, File History worked fine to My Book Duo 8tb with lots of space and mirrored drives. But today I went looking for something and I couldn’t find it. After looking into it more there is a LOT that is apparently missing. I have a folder with 162 subfolders (when viewed in File Explorer) and File History only shows 35.

The only thing I noticed that was odd was an error in the error log that said something about a “.gradle” file name being too long. I think there might also be something odd about “.” in filenames related to the Duo being Linux based? I’m not even sure what the .gradle is from, but probably from some Android development stuff.

So why are folders appearing to be missing?