While running a manual maintenance, I have found that Windows is actually defragmenting, not trimming my solid state drive! I found this out via opening the Optimize Drives panel. The "Current Status" column contained the text "Pass 1: 87% defragmented." I immediately cancelled this, and checked to see if clicking "Optimize" does this - it does not, and does the expected "Trim" procedure.
To me, this is a fatal flaw, if nothing else, as most of us know that not only do SSDs not need defragmenting, but it actually impacts the lifetime of it. I hope this does not go unnoticed in the final build, and am willing to offer every bit of information I can provide to the proper places.