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It's because algorithms are autistic. (I have autism myself.) The car is unable to parse the social context of driving on the road and will do exactly as asked.
I think it may go deeper than that. The Tesla may not understand that the speed limit isn't a request. You don't HAVE to go that fast. The sign doesn't imply that it's safe to go that fast right now
You can legally go slower than the limit, and it can be the case that it's safer to do that. But usually the safest choice is to drive at the speed limit, since that's what others tend to do - if the limit is 85 and you drive 35, there's a serious risk someone will bump into you.
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