High Sierra file sorting issue

I've noticed that when apps in 10.13 generate file lists, they come out in an apparently random order. I first noticed this in Logic Pro X, where the custom icons window was all out of order (they're supposed to be sorted by filename). I then noticed the same issue in a couple of other apps.

I created an automator app to create file lists, and fed it a folder with identical, sequentially named files and got this:

~/Desktop/Test/J.txt

~/Desktop/Test/K.txt

~/Desktop/Test/I.txt

~/Desktop/Test/H.txt

~/Desktop/Test/L.txt

~/Desktop/Test/Z.txt

~/Desktop/Test/M.txt

~/Desktop/Test/O.txt

~/Desktop/Test/X.txt

~/Desktop/Test/Y.txt

~/Desktop/Test/N.txt

~/Desktop/Test/C.txt

~/Desktop/Test/T.txt

~/Desktop/Test/U.txt

~/Desktop/Test/B.txt

~/Desktop/Test/W.txt

~/Desktop/Test/V.txt

~/Desktop/Test/A.txt

~/Desktop/Test/R.txt

~/Desktop/Test/E.txt

~/Desktop/Test/D.txt

~/Desktop/Test/S.txt

~/Desktop/Test/Q.txt

~/Desktop/Test/F.txt

~/Desktop/Test/G.txt

~/Desktop/Test/P.txt

I copied the same folder over to a non-APFS volume and the list was in the correct order, so it seems to be an issue with APFS.

Does anyone have any thoughts on this?