I've been having these issues ever since the first 2024.* update I received in Feb. Roads where I have never had an issue with AP and speed limits (sept 21), now suddenly have issues reading, mostly, signs that are above 60MPH. You can see on the screen that they don't even register with the cameras. I did find that if I disengage AP, pull into a parking lot, and then get back on the road, it seems to pull the speed limit from the database and properly. That pulling off the road ever time it misses a speed limit sign isn't really a good option. I just took a 500 mile trip that included county roads, as well as interstate highways. Mostly on the interstate, it would read the 70MPH signs, but almost ever on the 4 land county/state highways.
Bottom line, the speed limit reading capability is has been messed up since the 2024.* releases. I've been doing bug reports, tweeting, etc, but no response. I've even posted a thread on here that got no replies so...