Reconcile playerFeet vs pathStart

When you sneak off the edge of a block, your playerFeet is in the air, but your pathStart is back on top of that block.

All the stuff that determines if you're in the goal uses playerFeet currently, but perhaps it should use pathStart instead... because path calculation starts at pathStart not playerFeet, so it sometimes tries to calculate a path where pathStart is in the goal, but playerFeet aren't, or vice versa. Very rare, but could plausibly cause it to get stuck while completing a temporary process.