Is this MX a “refreshed” model with horizontal screen, or a “legacy” model with vertical screen? I just got 10.8 on my 2018 S100D, verical screen of course, and have the same issue, current speed limit disappears from display behind steering wheel when enabling AP.While there aren't that many Model X's with FSD beta yet it does present some different issues from other models (especially the 3 & Y).
I hope this thread will be useful for those of us using FSD beta on a Model X.
The first issue I noticed was that the display no longer shows the last speed limit sign that the vehicle observed. Previously I referred to that quite often and find that I really miss it. Here are images with FSD beta 10.2 on and then with it off.
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SO, if your MX is a refreshed model with horizontal screen, has the issue with speed limit display missing been fixed in 10.8 for you?