Currently, any ranger checking tracks a dragon PC has gone through will find dragon tracks whether or not the dragon is shifted into their human form - presumably, the same holds true for rakshasa.
The polymorph is more than a simple illusion, and is an actual change of shape/form/size (or else dragons would have a hard time fitting anywhere). their feet should leave the tracks of whatever race they're imitating as their feet will have actually changed shape.
Understanding that race on *looks* was removed due to the difficulty of having *looks* display human or otherwise for a dragon character, perhaps adding the Trackless Step feat to 5% races to serve a similar purpose would be sensible?
Trackless Step for 5% races
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