Just after the Frequently Used Apps page renders post reboot, the bottom row of apps disappears.This happens on my S9+ and Note 10+.The Frequently Used Apps page is set to the default page.If i have my rows set to n, it show n rows and then instantly that changes to n-1.
@Clinteastman I have seen this problem as well. Recently it did not happen every upgrade, but it has also happened occasionally at random. I reported this here in a thread as well.
If I change the number of rows to a different value and then back, followed by restarting Launcher, the correct number of rows returns.