Why is MTB faster on dirt

I know this had been a hot topic…

Can anyone from Zwift help me understand why a MTB would be faster than a road bike on the jungle circuit? This seems like an unrealistic gameification. It could be the jungle circuit appears to me more tame than Zwift intends it, but I don’t see rocks, roots, technical sections, etc - stuff a full suspension MTB is made for.
I have a local towpath that is dirt, some gravel, some wooden bridges. I can push 20+ mph without much effort on my road bike…

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