As the title states, the display doesn’t update to show the bottom knob affecting the loop position. This bug seems to only affect the visual display, you can correctly hear the position of the loop changing.
I included a video to give you a better idea. For comparison note that the top knob functions correctly (mostly)*
*You can also see an additional glitch at the 8 second mark where turning the top knob simultaneously changes both end position AND loop position.