Don't have that issue here with my "external" Samsung T5 SSD drive.
With that, are you sure that WD My Passport is a full SSD drive?
Edit...I just connected my Samsung 840 Pro externally via SATA to USB cable and lo and behold it shows up in Optimize Drives as HDD.
Odd considering it's always shown as SSD when connected internally. All I can guess is it must be the cable. That said, my Samsung T5 is also connected externally via USB Type-C cable to the PC, yet it shows SSD, so...
At any rate I'm not losing any sleep over this because I think Windows internally will adjust accordingly.