I’m not sure if I should be marking this question as correct or not, as I am still very confused as to why everything was happening the way it was. Regardless, using the Ref Pose button, I was able to turn the dinosaur’s root bone 180º, which completely fixed the walking backwards problem. I didn’t need to reimport.
Has the Ref Pose button always been there, or was it added sometime after 4.7? I feel like I would’ve noticed that.