Well it actually does have root:
idk, could it be something during retarget, could still be the PSS since PSD preview uses PSS, but I made an ABP using the UEFN character from the game animation sample, a new PSS and a new PSD using only the idle, walk and run animations, and it shows the trajectory and root in the PSD:
then I made an ABP exactly the same for my custom character, same default PSS and same default PSD, and retargeted those 3 animations using default IK rig and retargeter settings, and still the same:
I’m out of ideas