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Imanginary speed signs?

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I have been driving long freeway distances in the desert West (Utah, Idaho) lately, using FSD Beta 11.3.6, and have experienced mysterious speed limit changes where Tessie changes the speed limit downwards inappropriately despite not having passed any speed sign. Also cases where we pass a regular white 'Speed Limit' sign, and it is not recognized. Using the thumb wheel, you can override that, but it is annoying.
 
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It uses both physical signs and stored information about roads. Could just have wrong existing information. This has been a known problem for many years. Tesla has made many improvements but new instances pop up occasionally.
It might be that users could be allowed to submit road speed suggestions (as you can via voice after disconnects from FSD). The problem, of course, is that in the many states that use something like 'Speed limit 50 unless otherwise posted' have so many speed limit changes it is hard to have them all correct, and they can change, particularly around road work
 
It might be that users could be allowed to submit road speed suggestions (as you can via voice after disconnects from FSD). The problem, of course, is that in the many states that use something like 'Speed limit 50 unless otherwise posted' have so many speed limit changes it is hard to have them all correct, and they can change, particularly around road work

Yep, it's a fairly tricky thing to get 100% right. Or even close. They rightfully error on the side of caution in every case I've experienced.