CLI validation turns non-bag directory into a bag and returns "true"

[nodanaonlyzuul]

Steps to Reproduce

$ echo "I'm just some text" > ~/Desktop/plain-old-directory/humble.txt

$ bagit validate ~/Desktop/plain-old-directory
true

$ ls -al ~/Desktop/plain-old-directory/
total 24
drwxr-xr-x   6 myname  staff  204 Oct 10 21:24 .
drwx------+ 27 myname  staff  918 Oct 10 21:21 ..
-rw-r--r--   1 myname  staff  107 Oct 10 21:24 bag-info.txt
-rw-r--r--   1 myname  staff   55 Oct 10 21:24 bagit.txt
drwxr-xr-x   2 myname  staff   68 Oct 10 21:24 data
-rw-r--r--   1 myname  staff   19 Oct 10 21:24 humble.txt

I'd expect this to not turn a previously non-bag directory into a bag.