The base Enter chain's liftEmptyBlock lifted an empty block out of the section (and split the fragment mid-run), so the caret left column 1 for the page below instead of moving on to column 2. Inside a section Enter now only splits the block; a list keeps its own escape. Claude-Session: https://claude.ai/code/session_01Gpw1ctsR8FrdNMrpqePtik