Just got this after getting 42.3 this morning. I noticed before this updated that my cameras were still calibrating for Navigate on Autopilot but in the release notes nothing is different. Cameras still at 99% calibration too.
I just uploaded 2018.42.4 on our Model 3. I'm hoping it fixes the slow on ramp speed when using drive on nav, or giving me more opportunities to autosteer when I'm under my set speed and the left lane is wide open. (still happened while under Mad Max mode)
Other bug fix that I could see is the usb stick playing nice with the dash cam.
Model 3 Dual Motor coming from 42.2 to 42.4. The patch notes show no signs of changes, looking at this thread its seems to be pushed before anyone can test it but I noticed m3_4_wifey further up this thread hoping it fixes slow downs entering on ramps. I noticed that too. I guess I'll see on Monday.