Switching rigs within a bank with the remote resets the temporary version of a rig. Selected effects, and volume at least return to the original stored values (as if you switched banks without storing). This does not happen if I switch rigs from Kemper's rig buttons.
That has always been the case. The idea is that when you're using the buttons on the Kemper, you're probably editing the performance and going back and forth between slots to compare changes, with the intent of eventually saving them when you're done.
When you're using the Remote, on the other hand, you're probably playing live, so all tweaks are interpreted as temporary: that way you can always be sure that every slot loads as it was originally saved.
(Going by memory here, but this explanation is in the manual somewhere.)